US2638542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shift register
Assignee: Monroe Calculating Machine Co
•
Filing: 1952-01-31
•
Granted: 1953-05-12
•
Expires: 1972-01-31
Abstract
No abstract record available.
Inventors
- 👤 Jr Howard M Fleming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:04
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/20; G11C19/202; H; H03; H03K; H03K5/00; H03K5/13
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2603746A
Cited
US2601089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |