US4863757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed circuit board
Assignee: Poly Flex Circuits Inc
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Filing: 1987-02-06
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Granted: 1989-09-05
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Expires: 2007-02-06
Abstract
Abstract A method for producing a circuit board having conductive circuit elements patterened on a non-conductive substrate involves printing a film of a U.V. curable ink composed of a suspension of silver-coated magnetite particles in a U.V. curable resin onto the substrate in a circuit pattern, subjecting the pattern to a magnetic field to move the magnetite particles to a position at or near the upper surface of the resin and effecting U.V. radiation cure of the U.V. curable ink.
Inventors
- 👤 David Durand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:00
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/10; H05K3/12; H05K3/1283; H01; H01B; H01B1/00; H01B1/20; H01B1/22; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H05K1/095; H05K3/22; H05K3/24; H05K3/245; H05K2201/00; H05K2201/08; H05K2201/083; H05K2203/00; H05K2203/10; H05K2203/104
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
150 words
A method for producing a circuit board having conductive circuit elements with a specific resistivity of less than 0.05 ohm/cm 2 patterned on a non-conductive substrate comprising a. printingn a film of U.V. curable ink onto the non-conductive substrate in a desired circuit pattern, said U.V. curable ink comprising a suspension of silver-coated magnetite particles in a U.V. curable resin. b. subjecting the resulting printed circuit pattern to a magnetic field sufficient to move the magnetite particles to a position at or near the upper surface of the resin without breaking the surface tension thereof or substantially increasing the thickness of the ink film from said substrate and c. effecting U.V. radiation cure of the U.V. curable ink by exposing said U.V. curable ink to a U.V. source having an output in the region between 360 nm and 420 nm for a time sufficient to cure said U.V. curable ink.
Claim 2
Independent Claim
150 words
A method for producing a circuit board having conductive circuit elements with a specific resistivity of less than 0.05 ohm/cm 2 patterned on a non-conductive substrate comprising a. printingn a film of U.V. curable ink onto the non-conductive substrate in a desired circuit pattern, said U.V. curable ink comprising a suspension of silver-coated magnetite particles in a U.V. curable resin. b. subjecting the resulting printed circuit pattern to a magnetic field sufficient to move the magnetite particles to a position at or near the upper surface of the resin without breaking the surface tension thereof or substantially increasing the thickness of the ink film from said substrate and c. effecting U.V. radiation cure of the U.V. curable ink by exposing said U.V. curable ink to a U.V. source having an output in the region between 360 nm and 420 nm for a time sufficient to cure said U.V. curable ink.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said U.V. curable ink comprises a mixture of a cycloaliphatic epoxy resin, and a cationic photoinitiator.
Claim 4
Dependent Claim
22 words
The method of claim 2 wherein said U.V. curable resin also contains, as a plasticizer, a plasticizing amount of a polyether polyol.
Claim 5
Dependent Claim
30 words
The method of claim 1 wherein said U.V. curable ink contains by volume 25 to 67 percent silver coated magnetite spheres based on the total volume of said curable ink.
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) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |