US4157936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of rendering an ink strippable
Assignee: AT&T Inc
•
Filing: 1978-02-21
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Granted: 1979-06-12
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Expires: 1998-02-21
Abstract
Abstract A method of rendering an ink, selected from the group consisting of an oil-modified alkyd ink and a drying oil ink, strippable from a surface, upon which it is applied and dried, is disclosed. The method comprises applying to the printed ink, prior to the drying thereof, a modifying powder comprising a petroleum resin.
Inventors
- 👤 John R. Piazza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:58
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/42; G03F7/422; H; H05; H05K; H05K2203/00; H05K2203/07; H05K2203/0756; H05K2203/0769; H05K2203/0779; H05K2203/0783
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
158 words
A method of forming a printed circuit board, which comprises: (a) printing a powder-retaining ink pattern of an ink selected from the group consisting of an oil-modified alkyd ink and a drying oil vehicle ink on a metal surface of a metal clad dielectric base, said ink pattern corresponding to a desired circuit pattern; (b) applying to said printed surface while said ink is wet or tacky, a modifying powder comprising a petroleum resin to deposit a retained powder deposit only on said printed pattern to form a powdered ink pattern; (c) heating at least said powdered ink pattern to at least fuse said modifying powder contained thereon to form a surface having a modifying coat over said ink pattern; (d) treating said modifying coat containing surface with a suitable etchant to selectively remove uninked portions of the metal surface; and (e) treating said etched surface with a suitable solvent to remove said modifying coat covered ink pattern.
Claim 2
Independent Claim
158 words
A method of forming a printed circuit board, which comprises: (a) printing a powder-retaining ink pattern of an ink selected from the group consisting of an oil-modified alkyd ink and a drying oil vehicle ink on a metal surface of a metal clad dielectric base, said ink pattern corresponding to a desired circuit pattern; (b) applying to said printed surface while said ink is wet or tacky, a modifying powder comprising a petroleum resin to deposit a retained powder deposit only on said printed pattern to form a powdered ink pattern; (c) heating at least said powdered ink pattern to at least fuse said modifying powder contained thereon to form a surface having a modifying coat over said ink pattern; (d) treating said modifying coat containing surface with a suitable etchant to selectively remove uninked portions of the metal surface; and (e) treating said etched surface with a suitable solvent to remove said modifying coat covered ink pattern.
Claim 3
Dependent Claim
19 words
The method as defined in claim 1 wherein said oil-modified alkyd ink comprises a soybean oil-modified isophthalic pentaerithrytol alkyd.
Claim 4
Dependent Claim
22 words
The method as defined in claim 2 wherein said modifying powder comprises an aliphatic polymer resulting predominantly from a five carbon diolefin.
Claim 5
Dependent Claim
18 words
The method as defined in claim 1 wherein said drying oil vehicle ink comprises a linseed oil vehicle.
Claim 6
Dependent Claim
22 words
The method as defined in claim 4 wherein said modifying powder comprises an aliphatic polymer resulting predominantly from a five carbon diolefin.
References Cited (Backward Citations)
US2602731A
Cited
US3320657A
Cited
US3440076A
Cited
US3666549A
Cited
US3628999A
Cited
US4001466A
Cited
US3911160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-11 | 1982-12-11 | 1983-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-11 | 1986-12-11 | 1987-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-11 | 1990-12-11 | 1991-06-12 | $7700.00 | Window Closed / Lapsed |