Patent US1619854A successfully refreshed from Google Patents.
US3816273A
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Method of chemically forming wire
Assignee: General Dynamics Corp
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Filing: 1972-12-22
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Granted: 1974-06-11
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Expires: 1992-12-22
Abstract
Abstract Disclosed is a method for chemically forming wire.
Inventors
- 👤 H Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:12
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/02; C25; C25F; C25F3/00; C25F3/16
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
20 words
The method of claim 1 wherein the electrically conductive material susceptible to chemical etching is nickel or a nickel alloy.
Claim 2
Dependent Claim
37 words
The method of claim 1 wherein the electrically conductive material susceptible to chemical etching is selected from the group consisting of iron, iron alloy, magnesium, magnesium alloy, zinc, zinc alloy, titanium, titanium alloy, aluminum and aluminum alloy.
Claim 3
Independent Claim
100 words
A method of chemically forming a plurality of elongated nickel or nickel alloy wires from sheet material comprising the steps of: chemically etching opposite sides of the sheet material to remove any work-hardened surface layers therefrom; masking aligned chemically resistant patterns on the chemically etched opposite sides of the sheet material; chemically milling the unmasked portions of the sheet material to cut-through between the wires formed between the aligned masked patterns; overmilling the wires to reduce the cut-through ridges on the wires; removing the masking patterns from the wires; and electro-chemically polishing the wires to round the sharp edges thereof.
Claim 4
Dependent Claim
32 words
The method of claim 4 wherein the masking of aligned chemically resistant patterns is produced by photo exposure and development of a photoresist applied to the opposite sides of the sheet material.
Claim 5
Dependent Claim
18 words
The method of claim 4 wherein the sheet material is from 0.010 inches and 0.10 inches in thickness.
Claim 6
Dependent Claim
22 words
The method of claim 6 wherein from between 0.0005 inches and 0.0015 inches are chemically removed during the initial chemically etching step.
Claim 7
Dependent Claim
14 words
The method of claim 4 wherein thE chemical etchant is 40* Baume ferric chloride.
Claim 8
Dependent Claim
21 words
The method of claim 8 wherein the overmilling step is approximately 20-80 percent of the time of the chemically milling step.
Claim 9
Dependent Claim
28 words
The method of claim 4 wherein the electro-chemically polishing step includes an initial activation in a dilute acid bath of between 10-20 percent HNO3 for from 10-60 seconds.
Claim 10
Dependent Claim
37 words
The method of claim 4 wherein the electro-chemical polishing is performed in a solution of 50 percent H2SO4, 30 percent H3PO4, and 20 percent H2O with the wires as the positive terminal of a DC electrical current.
Claim 11
Dependent Claim
29 words
The method of claim 11 wherein the electro-chemical polishing is performed for between 5-10 minutes at current densities of approximately 100-2,500 amperes per square foot of exposed wire surface.
Claim 12
Dependent Claim
21 words
The method of claim 11 wherein the electro-chemical polishing solution is maintained at a temperature approximately between 32* and 65* C.
Claim 13
Dependent Claim
21 words
The method of claim 13 wherein the electro-chemical polishing solution is maintained at a temperature approximately between 50* and 60* C.
Claim 14
Dependent Claim
25 words
The method of claim 11 wherein the electro-chemically polishing step includes a final rinse in water to remove any nickel sulfate deposits from the wires.
Claim 15
Independent Claim
91 words
A method of chemically forming a plurality of elongated wires from a self-supporting sheet of electrically conductive material susceptible to chemical etching comprising the steps of: chemically etching opposite sides of the sheet material to remove any hardened surface layers therefrom; masking aligned chemically resistant patterns on the chemically etched opposite sides of the sheet of material; chemically milling the unmasked portions of the sheet of material to cut-through between the wires formed between the aligned masked patterns; and electro-chemically polishing the wires to round the sharp edges of the wires.
Claim 16
Independent Claim
117 words
A method of chemically forming a plurality of elongated free form wires comprising the steps of: providing a substantially rigid, unbacked, flat sheet of an electrically conductive material susceptible to chemical etching; chemically etching the opposed flat sides of the sheet to remove any hardened surface layers therefrom; masking aligned chemically resistant patterns on the chemically etched opposed flat sides of the sheet; chemically milling the unmasked portions of the sheet to cut-through between the wires formed between the aligned chemically resistant masked patterns; overmilling the formed wires to reduce the cut-through ridges remaining on the wires; removing the masking patterns from the formed wires; and electro-chemically polishing the formed wires to round the sharp edges thereof.
Claim 17
Independent Claim
146 words
A method of chemically forming a plurality of elongated nickel or nickel alloy free form wires comprising the steps of: providing a flat sheet of nickel or nickel alloy material having a thickness between 0.010 and 0.10 inches; chemically etching from between 0.0005 to 0.0015 inches from each of the two opposed flat surfaces of said sheet to remove any hardened surface layers therefrom; masking aligned chemcially resistant patterns on the chemically etched opposed flat surfaces by a photo resist process: chemically milling the unmasked portions of the sheet to cut-through between the wires formed between the aligned chemically resistant masked patterns: overmilling the formed wires an additional 20 to 80 percent of the chemical milling time to reduce the cut-through ridges remaining on the wires; removing the masking patterns from the overmilled wires; and electro-chemically polishing the formed wires to round the sharp edges thereof.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |