US2877308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drift cancellation device for direct current integrators
Assignee: Individual
•
Filing: 1953-09-03
•
Granted: 1959-03-10
•
Expires: 1973-09-03
Abstract
No abstract record available.
Inventors
- 👤 Reiner Stewart
- 👤 David C Hughes
- 👤 Martin L Scheiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:28
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/38; H03F3/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2624847A
Cited
US2607528A
Cited
US2538488A
Cited
US2628268A
Cited
US2618751A
Cited
US2754374A
Cited
US2757283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-09 | 1962-09-08 | 1963-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-09 | 1966-09-08 | 1967-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-09 | 1970-09-08 | 1971-03-10 | $7700.00 | Window Closed / Lapsed |