Patent US5256474A successfully refreshed from Google Patents.
US5256474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for manufacturing printed circuit boards
Assignee: Gould Electronics Inc
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Filing: 1989-11-13
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Granted: 1993-10-26
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Expires: 2009-11-13
Abstract
Abstract There is disclosed a dual purpose separator-release plate (30) for the use in the lamination and drilling of printed circuit boards, comprising a substrate sheet of aluminum foil (32), covered on both sides with release material (34), the plates being placed in engagement with the foil surfaces (6) and (8) of a PC board prior to curing the epoxy layer (4), after curing, retaining the separator-release plates in engagement with the PC board, and which plates serve as drill entry and drill backup material.
Inventors
- 👤 James A. Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:55
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/56; B29C33/68; B32; B32B; B32B37/00; B32B37/14; B32B37/26; H; H05; H05K; H05K3/00; H05K3/02; H05K3/022; B32B2457/00; B32B2457/08; H05K2203/00; H05K2203/06; H05K2203/068; H05K3/0011; H05K3/0044; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
69 words
A dual purpose separator-release plate for use initially in the lamination and, subsequently, in drilling of printed circuit boards, comprising: a substrate sheet of aluminum foil; a layer of release material covering both sides of the substrate sheet, such that both sides may releaseably engage a printed circuit board simultaneously during manufacture; and the release material comprising a siloxazane polymer which is thermally stable to at least 375° C.
Claim 2
Dependent Claim
69 words
A dual purpose separator-release plate for use initially in the lamination and, subsequently, in drilling of printed circuit boards, comprising: a substrate sheet of aluminum foil; a layer of release material covering both sides of the substrate sheet, such that both sides may releaseably engage a printed circuit board simultaneously during manufacture; and the release material comprising a siloxazane polymer which is thermally stable to at least 375° C.
Claim 3
Dependent Claim
69 words
A dual purpose separator-release plate for use initially in the manufacturing and, subsequently, in drilling of printed circuit boards, comprising: a substrate sheet of aluminum foil from approximately 0.005 inches to approximately 0.025 inches thick; a layer of release material covering both sides of the substrate sheet, such that both sides may releaseably engage a printed circuit board simultaneously during manufacture; and the release material being a siloxazane polymer.
Claim 4
Dependent Claim
69 words
A dual purpose separator-release plate for use initially in the manufacturing and, subsequently, in drilling of printed circuit boards, comprising: a substrate sheet of aluminum foil from approximately 0.005 inches to approximately 0.025 inches thick; a layer of release material covering both sides of the substrate sheet, such that both sides may releaseably engage a printed circuit board simultaneously during manufacture; and the release material being a siloxazane polymer.
Claim 5
Dependent Claim
69 words
A dual purpose separator-release plate for use initially in the manufacturing and, subsequently, in drilling of printed circuit board, comprising: a substrate sheet of aluminum foil; a layer of release material covering both sides of the substrate sheet, such that both sides may releaseably engage a printed circuit board simultaneously during manufacture; and the release material being a siloxazane polymer of from approximately 1 to approximately 5 microns thick.
Claim 6
Dependent Claim
69 words
A dual purpose separator-release plate for use initially in the manufacturing and, subsequently, in drilling of printed circuit board, comprising: a substrate sheet of aluminum foil; a layer of release material covering both sides of the substrate sheet, such that both sides may releaseably engage a printed circuit board simultaneously during manufacture; and the release material being a siloxazane polymer of from approximately 1 to approximately 5 microns thick.
Claim 7
Dependent Claim
19 words
A separator-release plate according to claim 1 wherein the substrate is from approximately 0.005 to approximately 0.025 inches thick.
Claim 8
Dependent Claim
19 words
A separator-release plate according to claim 3 wherein the substrate is from approximately 0.005 to approximately 0.025 inches thick.
Claim 9
Dependent Claim
22 words
A separator-release plate according to claim 1 wherein the layer of siloxazane polymer is from approximately 1 to approximately 5 microns thick.
Claim 10
Dependent Claim
22 words
A separator-release plate according to claim 2 wherein the layer of siloxazane polymer is from approximately 1 to approximately 5 microns thick.
Claim 11
Dependent Claim
19 words
A separator-release plate according to claim 2 wherein the siloxazane polymer is thermally stable to at least 375° C.
Claim 12
Dependent Claim
19 words
A separator-release plate according to claim 3 wherein the siloxazane polymer is thermally stable to at least 375° C.
Claim 13
Dependent Claim
87 words
A dual purpose separator-release plate for use initially in the lamination and, subsequently, in the drilling of printed circuit boards, comprising: a substrate sheet of aluminum foil from approximately 0.005 inches to approximately 0.025 inches thick; a layer of release material from approximately 1 to approximately 5 microns thick covering both sides of the substrate sheet, such that both sides may releaseably engage a printed circuit board simultaneously during manufacture; and the release material comprising a siloxazane polymer which is thermally stable to at least 375° C.
Claim 14
Dependent Claim
87 words
A dual purpose separator-release plate for use initially in the lamination and, subsequently, in the drilling of printed circuit boards, comprising: a substrate sheet of aluminum foil from approximately 0.005 inches to approximately 0.025 inches thick; a layer of release material from approximately 1 to approximately 5 microns thick covering both sides of the substrate sheet, such that both sides may releaseably engage a printed circuit board simultaneously during manufacture; and the release material comprising a siloxazane polymer which is thermally stable to at least 375° C.
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) | 1996-10-25 | 1997-04-26 | 1997-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-25 | 2001-04-26 | 2001-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-25 | 2005-04-26 | 2005-10-26 | $7700.00 | Window Closed / Lapsed |