US2502479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor amplifier
Assignee: Ambrilia Biopharma Inc
•
Filing: 1948-09-24
•
Granted: 1950-04-04
•
Expires: 1968-09-24
Abstract
No abstract record available.
Inventors
- 👤 Gerald L Pearson
- 👤 Shockley William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:53
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/04; H03F3/14; H03D; H03D7/00; H03D7/12; H10; H10D; H10D99/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-03 | 1953-10-03 | 1954-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-03 | 1957-10-03 | 1958-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-03 | 1961-10-03 | 1962-04-04 | $7700.00 | Window Closed / Lapsed |