US3548269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistive layer semiconductive device
Assignee: Sprague Electric Co
•
Filing: 1968-12-03
•
Granted: 1970-12-15
•
Expires: 1988-12-03
Abstract
No abstract record available.
Inventors
- 👤 John D Macdougall
- 👤 Kenneth E Manchester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:36
CPC Classifications
H; H10; H10D; H10D1/00; H10D1/40; H10D1/43; H10P; H10P95/00; Y; Y10; Y10S; Y10S148/00; Y10S148/136
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2666814A
Cited
US2672528A
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US2570978A
Cited
US2586080A
Cited
US2878152A
Cited
US3343114A
Cited
US3443167A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |