US4325779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for shaping and finishing a workpiece
Assignee: A-1 ACQUISITION Corp
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Filing: 1980-11-17
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Granted: 1982-04-20
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Expires: 2000-11-17
Abstract
Abstract The invention includes the process of shaping a workpiece and for producing a surface contour complementary to the surface contour of a model. The process comprises the steps of applying a masking material to at least a portion of the surface of the workpiece to be shaped, the masking material being adapted to protect the surface from the effects of etchant. A template is then pressed against the surface, the template having a surface contour comprising a negative image of the surface contour to be formed in the workpiece, the template surface being comprised of material adapted to remove the masking material when the template is pressed against the surface and removed from the surface. The template is then withdrawn from the surface to remove masking material from those portions of the surface contacted by the template surface. Etchant is then applied to the surface not covered by the masking material. The steps of pressing the template against the surface to remove masking material and etching the surface of the workpiece are repeated until the surface contour of the workpiece conforms to the surface contour of the model.
Inventors
- 👤 James J. Rossetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:07
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/02; C23F1/04
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
172 words
A process for shaping a workpiece and for producing a workpiece surface contour complementary to the surface contour of a model desired to be reproduced, the process comprising the steps of: (a) providing a non-planar template which is a negative image of the workpiece surface contour to be reproduced; (b) applying a coating of an etchant resistant masking material to at least a portion of the surface of said workpiece, said masking material being adapted to protect said workpiece surface from the effects of etchant; (c) pressing said template against said workpiece surface; (d) withdrawing said template from said workpiece surface to selectively adhere the masking material to the template and correspondingly selectively remove masking material from those portions of said workpiece surface contacted by said non-planar template surface; (e) applying etchant to said workpiece surface to etch portions of said workpiece surface not covered by said masking material; and (f) repeating steps (b) through (e) until the surface contour of the workpiece conforms to the nonplanar surface contour of the model.
Claim 2
Dependent Claim
172 words
A process for shaping a workpiece and for producing a workpiece surface contour complementary to the surface contour of a model desired to be reproduced, the process comprising the steps of: (a) providing a non-planar template which is a negative image of the workpiece surface contour to be reproduced; (b) applying a coating of an etchant resistant masking material to at least a portion of the surface of said workpiece, said masking material being adapted to protect said workpiece surface from the effects of etchant; (c) pressing said template against said workpiece surface; (d) withdrawing said template from said workpiece surface to selectively adhere the masking material to the template and correspondingly selectively remove masking material from those portions of said workpiece surface contacted by said non-planar template surface; (e) applying etchant to said workpiece surface to etch portions of said workpiece surface not covered by said masking material; and (f) repeating steps (b) through (e) until the surface contour of the workpiece conforms to the nonplanar surface contour of the model.
Claim 3
Dependent Claim
68 words
A process as set forth in claim 1 wherein following the step of withdrawing said template, the process further includes the steps of cleaning said template of said masking material, and repeating said steps of pressing said template against said workpiece surface, withdrawing said template and cleaning said template of masking material until said template ceases to remove appreciable quantities of said masking material from said workpiece surface.
Claim 4
Dependent Claim
41 words
A process as set forth in claim 2 wherein following said steps of applying etchant, said process further includes the steps of cleaning said workpiece surface to thereby remove said masking material and recoating said workpiece surface with said masking material.
Claim 5
Dependent Claim
19 words
A process as set forth in claim 1 wherein said template is comprised of cast room temperature curing uethane.
Claim 6
Dependent Claim
33 words
A process as set forth in claim 1 wherein said step of applying a masking material to said metal workpiece includes the application of a coating of re-etching ink to said workpiece surface.
Claim 7
Dependent Claim
30 words
A process as set forth in claim 1 wherein said step of applying a masking material to said workpiece surface includes the application of asphaltum varnish to said workpiece surface.
Claim 8
Dependent Claim
34 words
A process as set forth in claim 1 wherein said workpiece includes a preformed cavity therein, said cavity having an internal surface, and wherein said coating material is applied to said preformed cavity surface.
Claim 9
Dependent Claim
32 words
A process as set forth in claim 1 and further including the step of covering portions of said workpiece to be protected from attack by acid with a protective covering of shellac.
Claim 10
Dependent Claim
27 words
A process as set forth in claim 1 wherein said step of applying etchant to said workpiece surface includes dipping said workpiece in an aqueous acid solution.
Claim 11
Dependent Claim
64 words
A process as set forth in claim 1 wherein after withdrawing of said template from said workpiece surface and before said step of applying acid to said workpiece surface, the process further includes th step of cleaning said template to remove coating material therefrom and placing said template against said workpiece surface to remove additional amounts of said coating material from said workpiece surface.
Claim 12
Dependent Claim
38 words
A process as set forth in claim 1 wherein, following said steps of applying etchant, said process further includes the steps of cleaning said workpiece surface to thereby remove masking material and recoating said surface with masking material.
Claim 13
Dependent Claim
50 words
A process as set forth in claim 1 wherein said model has a surface contour which is a positive image of the surface contour to be produced in said workpiece and further including the step of casting a hardenable material against the surface of said model to form said template.
Claim 14
Dependent Claim
68 words
A process as set forth in claim 1 wherein following the step of withdrawing said template, the process further includes the steps of cleaning said template of said masking material, and repeating said steps of pressing said template against said workpiece surface, withdrawing said template and cleaning said template of masking material until said template ceases to remove appreciable quantities of said masking material from said workpiece surface.
Claim 15
Dependent Claim
39 words
A process as set forth in claim 13 wherein, following said steps of applying etchant, said process further includes the steps of cleaning said surface to thereby remove said masking material and recoating said surface with said masking material.
Claim 16
Dependent Claim
19 words
A process as set forth in claim 12 wherein said template is comprised of cast room temperature curing urethane.
Claim 17
Dependent Claim
32 words
A process as set forth in claim 12 wherein said step of applying a masking material to said workpiece includes the application of a coating of re-etching ink to said workpiece surface.
Claim 18
Dependent Claim
30 words
A process as set forth in claim 12 wherein said step of applying a masking material to said workpiece surface includes the application of asphaltum varnish to said workpiece surface.
Claim 19
Dependent Claim
34 words
A process as set forth in claim 12 wherein said workpiece includes a preformed cavity therein, said cavity having an internal surface, and wherein said coating material is applied to said preformed cavity surface.
Claim 20
Dependent Claim
32 words
A process as set forth in claim 12 and further including the step of covering portions of said workpiece to be protected from attack by acid with a protective covering of shellac.
Claim 21
Dependent Claim
27 words
A process as set forth in claim 12 wherein said step of applying etchant to said workpiece surface includes dipping said workpiece in an aqueous acid solution.
Claim 22
Dependent Claim
39 words
A process as set forth in claim 12 wherein, following said steps of applying etchant, said process further includes the steps of cleaning said workpiece surface to thereby remove masking material and recoating said workpiece surface with masking material.
Claim 23
Dependent Claim
69 words
A process as set forth in claim 1 wherein said model has a surface contour which is a negative image of the surface contour to be produced in said workpiece and further including the steps of casting a hardenable material against the surface contour of said model to form a mold, casting a hardenable material in said mold to form said template, and separating said template from said mold.
Claim 24
Dependent Claim
68 words
A process as set forth in claim 22 wherein following the step of withdrawing said template, the process further includes the steps of cleaning said template of said masking material, and repeating said steps of pressing said template against said workpiece surface, withdrawing said template and cleaning said template of masking material until said template ceases to remove appreciable quantities of said masking material from said workpiece surface.
Claim 25
Dependent Claim
42 words
A process as set forth in claim 22 wherein, the following said steps of applying etchant, said process further includes the steps of cleaning said workpiece surface to thereby remove said masking material and recoating said workpiece surface with said masking material.
Claim 26
Dependent Claim
19 words
A process as set forth in claim 22 wherein said templates is comprised of cast room temperature curing urethane.
Claim 27
Dependent Claim
33 words
A process as set forth in claim 22 wherein said step of applying a masking material to said metal workpiece includes the application of a coating of re-etching ink to said workpiece surface.
Claim 28
Dependent Claim
30 words
A process as set forth in claim 22 wherein said step of applying a masking material to said workpiece surface includes the application of asphaltum varnish to said workpiece surface.
Claim 29
Dependent Claim
34 words
A process as set forth in claim 22 wherein said workpiece includes a preformed cavity therein, said cavity having an internal surface, and wherein said coating material is applied to said preformed cavity surface.
Claim 30
Dependent Claim
32 words
A process as set forth in claim 22 and further including the step of covering portions of said workpiece to be protected from attack by acid with a protective covering of shellac.
Claim 31
Dependent Claim
27 words
A process as set forth in claim 22 wherein said step of applying etchant to said workpiece surface includes dipping said workpiece in an aqueous acid solution.
Claim 32
Dependent Claim
39 words
A process as set forth in claim 22 wherein, following said steps of applying etchant, said process further includes the steps of cleaning said workpiece surface to thereby remove masking material and recoating said workpiece surface with masking material.
Claim 33
Dependent Claim
21 words
A process as set forth in claim 1 further including the step of maintaining the template in alignment with the workpiece.
Claim 34
Dependent Claim
43 words
A process as set forth in claim 32 wherein said step of maintaining alignment includes orienting the template to the workpiece to thereby linearly and repeatedly contact the same portions of the template and the workpiece surface during the pressing and withdrawing steps.
Claim 35
Dependent Claim
22 words
A process as set forth in claim 32 wherein said pressing and withdrawing steps include rolling the template across the workpiece surface.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-19 | 1985-10-19 | 1986-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-19 | 1989-10-19 | 1990-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-19 | 1993-10-19 | 1994-04-20 | $7700.00 | Window Closed / Lapsed |