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US3700538A
Expired / Lapsed
US
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Polyimide resin-fiberglass cloth laminates for printed circuit boards
Assignee: National Aeronautics and Space Administration
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Filing: 1970-09-10
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Granted: 1972-10-24
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Expires: 1990-09-10
Abstract
Abstract NONFLAMMABLE PRINTED CIRCUIT BOARD LAMINATES HAVING A LOW COEFFICIENT OF THERMAL EXPANSION IN THE THICKNESS DIRECTION ARE MADE OF MULTIPLE PLIES OF POLYIMIKDE-RESINIMPREGNATED FIBERGLASS CLOTH. A STACKED ARRAY OF RESIN-IMPREGNATED CLOTH SHEETS IS HEATED UNDER PRESSURE TO B-STAGE CURING TEMPERATURE, AND THE RESULTING LAMINATE IS POST CURED BY FURTHER HEATING IN AIR. COPPER CLADDING IS APPLIED BY PLACING ADHESIVE-COATED FOIL IN CONTACT WITH THE LAMINATE BEFORE OR AFTER B-STAGE CURING. FURTHER CONTROL OF THERMAL AND ELECTRICAL PROPERTIES OF THE LAMINATE IS REALIZED BY USE OF A FINELY DIVIDED INORGANIC FILLER SUCH AS SILICA OR CALCIUM SILICATE.
Inventors
- 👤 Bobby W Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:14
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; H05K1/0353; H05K1/0373; H05K3/00; H05K3/38; H05K3/386; H05K1/0366; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/0154; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0209; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; H05K2201/0358; H05K2201/06; H05K2201/068; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T442/00; Y10T442/30; Y10T442/3382; Y10T442/3415; Y10T442/3423; Y10T442/3431
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |