US4793218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming knife blades by photo-chemical etching
Assignee: Individual
•
Filing: 1987-10-09
•
Granted: 1988-12-27
•
Expires: 2007-10-09
Abstract
Abstract A method of forming knife blades from a flat section of pre-hardened metal such that each blade has a predetermined shape, includes the steps of photo-chemically etching a plurality of blanks from the section of metal so that each blank has a respective predetermined shape; and sharpening at least one edge of each blank by grinding the at least one edge.
Inventors
- 👤 George Jordan
- 👤 Dimitri G. Mondiadis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:03
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/32; A61B17/3209; A61B17/3211; B; B23; B23P; B23P15/00; B23P15/28; B23P15/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
64 words
A method of forming knife blades from a flat section of pre-hardened metal such that each blade has a predetermined shape, comprising the steps of: photo-chemically etching a plurality of blanks from said flat section of pre-hardened metal so that each said blank has a respective predetermined shape; and sharpening at least one edge of each blank by grinding said at least one edge.
Claim 2
Independent Claim
64 words
A method of forming knife blades from a flat section of pre-hardened metal such that each blade has a predetermined shape, comprising the steps of: photo-chemically etching a plurality of blanks from said flat section of pre-hardened metal so that each said blank has a respective predetermined shape; and sharpening at least one edge of each blank by grinding said at least one edge.
Claim 3
Dependent Claim
26 words
A method according to claim 1; wherein said step of sharpening includes the step of grinding said at least one edge by a rotating grinding wheel.
Claim 4
Dependent Claim
19 words
A method according to claim 1; wherein said predetermined shape facilitates securing each said knife blade to a handle.
Claim 5
Dependent Claim
17 words
A method according to claim 3; wherein said predetermined shape includes an assymetric shape or screw threads.
Claim 6
Dependent Claim
24 words
A method according to claim 1; wherein said flat section of metal is a section of flat stock of pre-hardened and pre-rolled stainless steel.
Claim 7
Dependent Claim
77 words
A method according to claim 1; wherein said step of photo-chemically etching includes the steps of: covering an entire surface of said flat section of metal with a photo-chemical etchant; placing a transparency having light blocking areas which define the knife blanks to be formed, over said covered surface; and exposing said transparency to light such that said photo-chemical etchant etches away all of said flat section except in portions thereof covered by said light blocking areas.
Claim 8
Dependent Claim
15 words
A method according to claim 6; wherein said photo-chemical etchant is a metal containing compound.
Claim 9
Dependent Claim
63 words
A method according to claim 1; wherein said step of photo-chemically etching includes the steps of: covering an entire surface of said flat section of metal with a photo-chemical etchant except in predetermined areas corresponding to said predetermined shapes; exposing said covered surface to light such that said photo-chemical etchant etches away said flat section only in areas thereof covered by said etchant.
Claim 10
Dependent Claim
15 words
A method according to claim 8; wherein said photo-chemical etchant is a metal containing compound.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-27 | 1992-06-27 | 1992-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-27 | 1996-06-27 | 1996-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-27 | 2000-06-27 | 2000-12-27 | $7700.00 | Window Closed / Lapsed |