Patent US4814259A successfully refreshed from Google Patents.
US4814259A
Expired / Lapsed
US
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Laser generated electrically conductive pattern
Assignee: Boeing North American Inc
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Filing: 1987-11-09
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Granted: 1989-03-21
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Expires: 2007-11-09
Abstract
Abstract A conductive or semiconductive pattern of a metal sulfide or selenide such as copper, cadmium, cobalt or nickel sulfide, is provided on a substrate. The pattern may have a resistivity in the range of 1 to 106 ohms per square. It is formed by coating the surface with a solution containing a salt of one of the metals which is capable of being converted to a divalent metal compound, a sulfur group donor such as thiourea, and a solvent such as methanol or water. The solution is dried, and then selected portions of the coated surface are irradiated with a laser beam. This thermally converts the irradiated metal salt into a metal sulfide. The unreacted solution is then washed from the substrate to leave a conductive pattern. The desired conductivity of the pattern can be obtained by selecting the proper metal salt, concentration of salt in the solution, and the energy of the radiation.
Inventors
- 👤 Paul R. Newman
- 👤 Leslie F. Warren, Jr.
- 👤 Patricia H. Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:23
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/4505; C04B41/455; C04B41/50; C04B41/5007; C04B41/5014; C04B41/80; C04B41/81; C04B41/85; G; G03; G03F; G03F7/00; G03F7/004; G03F7/0042; G03F7/0043; H; H01; H01B; H01B1/00; H01B1/06; H01B1/10; H05; H05K; H05K3/00; H05K3/10; H05K3/105; H10; H10P; H10P14/00; H10P14/40; H10P14/412; C04B2111/00; C04B2111/00474; C04B2111/00844; C04B2111/90; C04B2111/94; H05K2203/00; H05K2203/10; H05K2203/107; H05K2203/12; H05K2203/125; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
76 words
A method of producing an electrically conductive or semiconductive pattern on a substrate, which comprises: providing a substrate; providing a solution containing a soluble nickel salt capable of being converted to nickel sulfide, a sulfur donor, and a solvent; coating the surface of the substrate with the solution; evaporating solvent from the coated surface of the substrate; irradiating selected portions of the coated surface to form an electrically conductive pattern of nickel sulfide on the substrate.
Claim 2
Independent Claim
76 words
A method of producing an electrically conductive or semiconductive pattern on a substrate, which comprises: providing a substrate; providing a solution containing a soluble nickel salt capable of being converted to nickel sulfide, a sulfur donor, and a solvent; coating the surface of the substrate with the solution; evaporating solvent from the coated surface of the substrate; irradiating selected portions of the coated surface to form an electrically conductive pattern of nickel sulfide on the substrate.
Claim 3
Dependent Claim
35 words
The method as claimed in claim 1 wherein the substrate is a material selected from the group consisting of ceramic, metal, plastic, semiconductor, fiberglass, fiberglass reinforced Kapton, Kapton, Bakelite, alumina, and board for printed circuits.
Claim 4
Dependent Claim
12 words
The method as claimed in claim 1 wherein the solvent is water.
Claim 5
Dependent Claim
12 words
The method as claimed in claim 1 wherein the solvent is methanol.
Claim 6
Dependent Claim
33 words
The method as claimed in claim 1 wherein the soluble nickel salt is selected from the group consisting of nickel acetate tetrahydrate, nickel acetate, nickel sulfate, nickel chloride, nickel nitrate, and nickel tetrafluoroborate.
Claim 7
Dependent Claim
31 words
The method as claimed in claim 1 wherein the sulfur donor is selected from the group consisting of thiourea, alkali metal thiosulfates, ammonium thiosulfates, alkali metal thiophosphates, ammonium thiophosphates, and thioacetamide.
Claim 8
Dependent Claim
33 words
The method as claimed in claim 1 wherein the nickel salt concentration ranges from about 0.05 to about 2 molar, and the sulfur donor concentration ranges from about 0.05 to about 2 molar.
Claim 9
Dependent Claim
21 words
The method as claimed in claim 1 wherein the irradiating of selected portions comprises irradiating selected portions with a laser beam.
Claim 10
Dependent Claim
26 words
The method as claimed in claim 8 wherein the laser beam is a CO 2 laser having a power density of about 40 W/cm 2 .
Claim 11
Dependent Claim
31 words
The method as claimed in claim 8 wherein the fluence of the laser radiation is in the range of about 1 W sec/cm 2 to about 25 W sec/cm 2 .
Claim 12
Dependent Claim
29 words
The method as claimed in claim 8 wherein the fluence of the laser radiation is selected to obtain a desired conductivity in the irradiated portions of the coated substrate.
Claim 13
Dependent Claim
18 words
The method as claimed in claim 1 including washing the substrate to remove unreacted reagents from the surface.
Claim 14
Dependent Claim
20 words
The method as claimed in claim 1 wherein the substrate is etched prior to coating its surface with the solution.
Claim 15
Independent Claim
102 words
A method of producing an electrically conductive pattern on a substrate, comprising: providing a substrate; providing a solution containing a soluble metal salt which is capable of being converted to a divalent metal compound selected from the group consisting of soluble salts of copper, cadmium, cobalt, and nickel, a donor selected from the sulfur group consisting of sulfur and selenium and a solvent; coating the surface of the substrate with the solution; evaporating solvent from the coated surface of the substrate; irradiating selected portions of the coated surface to form an electrically conductive pattern of the divalent metal compound on the substrate.
Claim 16
Independent Claim
102 words
A method of producing an electrically conductive pattern on a substrate, comprising: providing a substrate; providing a solution containing a soluble metal salt which is capable of being converted to a divalent metal compound selected from the group consisting of soluble salts of copper, cadmium, cobalt, and nickel, a donor selected from the sulfur group consisting of sulfur and selenium and a solvent; coating the surface of the substrate with the solution; evaporating solvent from the coated surface of the substrate; irradiating selected portions of the coated surface to form an electrically conductive pattern of the divalent metal compound on the substrate.
Claim 17
Independent Claim
82 words
A method of generating an electrically conductive pattern on a substrate comprising the steps of: providing a substrate; providing a solution of nickel acetate, thiourea, and a solvent; coating the surface of the substrate with the solution; evaporating solvent to leave a film of the nickel acetate and thiourea on the surface; irradiating selected areas of the surface with a laser beam to form an electrically conducting pattern of nickel sulfide; and washing the surface to remove unreacted portions of the film.
Claim 18
Independent Claim
82 words
A method of generating an electrically conductive pattern on a substrate comprising the steps of: providing a substrate; providing a solution of nickel acetate, thiourea, and a solvent; coating the surface of the substrate with the solution; evaporating solvent to leave a film of the nickel acetate and thiourea on the surface; irradiating selected areas of the surface with a laser beam to form an electrically conducting pattern of nickel sulfide; and washing the surface to remove unreacted portions of the film.
References Cited (Backward Citations)
US29015A
Cited
USRE29015E
Cited
US3930963A
Cited
US3940533A
Cited
JPS5252A
Cited
US4363707A
Cited
US4426442A
Cited
US4564589A
Cited
JPH01104083A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |