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US4290838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for vacuum lamination of flex circuits
Assignee: Hughes Missile Systems Co
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Filing: 1979-08-17
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Granted: 1981-09-22
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Expires: 1999-08-17
Abstract
Abstract A vacuum laminating fixture includes a pair of opposed plates having opposed plane faces with a peripheral groove formed in each plate surrounding the face with the grooves matched for receiving a unitary band seal extending between the grooves for sealing the space between the faces of the plates, a vacuum port is formed in the lower plate communicating with the area of the face inside the peripheral groove. The method includes setting up a laminate of plural flexible sheets of circuit, placing the laminate within and between the faces of the plates, drawing a vacuum of 28 inches of mercury for a period of two minutes to completely evacuate the space between the laminate sheets, and thereafter applying a predetermined curing pressure and temperature to the plates within a press.
Inventors
- 👤 Joseph A. Reavill
- 👤 John M. Arachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:01
CPC Classifications
B; B32; B32B; B32B37/00; B29; B29C; B29C43/00; B29C43/02; B29C43/20; B29C43/203; B29C43/32; B29C43/36; B29C43/3607; B29C43/56; B30; B30B; B30B1/00; B32B37/10; B32B37/1018; H; H05; H05K; H05K3/00; H05K3/46; H05K3/4611; H05K3/4626; H05K3/4635; B29C43/3642; B29C2043/3644; B29C2791/00; B29C2791/004; B29C2791/006; B29C33/00; B29C33/20; B29L; B29L2009/00; H05K1/00; H05K1/02; H05K1/03; H05K1/0393; H05K2203/00; H05K2203/06; H05K2203/068
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
113 words
A method of laminating printed circuits comprising: selecting a sealable press fixture having opposed plates defining upper and lower planar faces and including a peripheral band seal extending between the plates; forming a laminate of flexible sheets of circuits with an adhesive between said sheets; placing the laminate of circuits between said plates in said fixture for engagement thereby; closing said fixture; applying a vacuum in the fixture for drawing air from between said sheets of circuit while supporting the face of said upper plate out of engagement with said laminate; maintaining the vacuum for predetermined period of time; and applying pressure to the press fixture for forcing the laminate to bond together.
Claim 2
Independent Claim
113 words
A method of laminating printed circuits comprising: selecting a sealable press fixture having opposed plates defining upper and lower planar faces and including a peripheral band seal extending between the plates; forming a laminate of flexible sheets of circuits with an adhesive between said sheets; placing the laminate of circuits between said plates in said fixture for engagement thereby; closing said fixture; applying a vacuum in the fixture for drawing air from between said sheets of circuit while supporting the face of said upper plate out of engagement with said laminate; maintaining the vacuum for predetermined period of time; and applying pressure to the press fixture for forcing the laminate to bond together.
Claim 3
Dependent Claim
14 words
The method of claim 1 including the step of selecting a high viscosity glue.
Claim 4
Dependent Claim
14 words
The method of claim 1, wherein said adhesive is selected to have no flow.
Claim 5
Dependent Claim
13 words
The method of claim 3, wherein said adhesive is a dry film adhesive.
Claim 6
Dependent Claim
11 words
The method of claim 4, wherein said adhesive is an acrylic.
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) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |