US4960614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed circuit board
Assignee: Poly Flex Circuits Inc
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Filing: 1989-06-14
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Granted: 1990-10-02
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Expires: 2009-06-14
Abstract
Abstract A method for producing a circuit board involves printing a U.V. curable ink onto a substrate in a desired circuit pattern and curing the ink by exposing it to a pulsed U.V. source having an output in the region between 360 nm and 420 nm in a pulsing manner consisting of 5 to 8 one-half second exposure periods where each exposure period is followed by a non-exposure period of about 2 to 3 seconds.
Inventors
- 👤 David Durand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:49
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/10; H05K3/12; H05K3/1283; C; C09; C09D; C09D11/00; C09D11/02; C09D11/10; C09D11/101; C09D11/52; H01; H01B; H01B1/00; H01B1/20; H01B1/22; H01F; H01F41/00; H01F41/14; H01F41/16; 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: 10
Claim 1
Independent Claim
102 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 nonconductive substrate comprising: a. printing a U.V. curable ink onto the nonconductive substrate in a desired circuit pattern, and b. 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 a region between 360 nm and 420 nm in a pulsing manner consisting of 5 to 8 one-half second exposure periods, each exposure period followed by a non-exposure period of about 2 to 3 seconds.
Claim 2
Independent Claim
102 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 nonconductive substrate comprising: a. printing a U.V. curable ink onto the nonconductive substrate in a desired circuit pattern, and b. 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 a region between 360 nm and 420 nm in a pulsing manner consisting of 5 to 8 one-half second exposure periods, each exposure period followed by a non-exposure period of about 2 to 3 seconds.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein said U.V. source is an electrodeless U.V. source.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein said electrodeless U.V. source is provided with iron oxide as a dopant.
Claim 5
Dependent Claim
46 words
The method of claim 1 wherein said U.V. curable ink comprises from about 30 to 33 weight percent of a thermosetting resin binder and 70 to 67 weight percent of spherical or spheroidal conductive particles having a particle size distribution ranging from 1 to 30 microns.
Claim 6
Dependent Claim
35 words
The method of claim 4 wherein said conductive particles comprise silver coated glass spheres wherein the silver comprises about 8 to 12 weight percent based on the total weight of said silver coated glass spheres.
Claim 7
Dependent Claim
20 words
The method of claim 4 wherein said U.V. curable ink also includes an effective amount of a ketone-amine curing agent.
Claim 8
Dependent Claim
13 words
The method of claim 6 wherein said ketone-amine curing agent comprises Michler's ketone.
Claim 9
Dependent Claim
18 words
The method of claim 7 wherein said ketone-amine curing agent comprises a mixture of benzophenone and Michler's ketone.
Claim 10
Dependent Claim
20 words
The method of claim 4 wherein said silver coated glass spheres have an average particle size of about 15 microns.
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) | 1993-10-01 | 1994-04-02 | 1994-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-01 | 1998-04-02 | 1998-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-01 | 2002-04-02 | 2002-10-02 | $7700.00 | Window Closed / Lapsed |