US2897448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for measuring alpha of transistors
Assignee: AT&T Inc
•
Filing: 1953-06-23
•
Granted: 1959-07-28
•
Expires: 1973-06-23
Abstract
No abstract record available.
Inventors
- 👤 Raisbeck Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:23
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/26; G01R31/2607; G01R31/2608; G01R31/2614
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1831744A
Cited
US2213099A
Cited
US2195439A
Cited
US2550518A
Cited
US2585078A
Cited
US2556296A
Cited
US2587697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-27 | 1963-01-26 | 1963-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-27 | 1967-01-26 | 1967-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-27 | 1971-01-26 | 1971-07-28 | $7700.00 | Window Closed / Lapsed |