US4614963A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastics encapsulated electronic devices
Assignee: Plessey Overseas Ltd
•
Filing: 1983-11-18
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Granted: 1986-09-30
•
Expires: 2003-11-18
Abstract
Abstract The plastic encapsulation material covering an integrated circuit is impregnated with a corrosion inhibitor evenly dispensed throughout the material. This inhibits the corrosion of the metallization on the surface of the integrated circuit thus prolonging the life of the device particularly under adverse environmental conditions.
Inventors
- 👤 Jack Brettle
- 👤 Martin T. Goosey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:57
CPC Classifications
H; H01; H01G; H01G2/00; H01G2/12; H05; H05K; H05K3/00; H05K3/22; H05K3/28; H05K3/282; H10; H10W; H10W74/00; H10W74/40; H10W74/47; H05K3/285; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/23; Y10T428/239
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
27 words
A plastic encapsulated electronic device in which p-Cresol is present in the plastic material to reduce corrosion of the metallisation during the lifetime of the electronic device.
Claim 2
Dependent Claim
27 words
A plastic encapsulated electronic device in which p-Cresol is present in the plastic material to reduce corrosion of the metallisation during the lifetime of the electronic device.
Claim 3
Dependent Claim
28 words
A plastic encapsulated electronic device as claimed in claim 1 in which the p-Cresol is present in the plastic at a concentration of approximately 1800 parts per million.
References Cited (Backward Citations)
US3939488A
Cited
US4327369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |