US2947478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic calculator
Assignee: International Business Machines Corp
•
Filing: 1955-05-16
•
Granted: 1960-08-02
•
Expires: 1975-05-16
Abstract
No abstract record available.
Inventors
- 👤 John J Lentz
- 👤 John H Palmer
- 👤 Robbins Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:29
CPC Classifications
G; G06; G06F; G06F15/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2514036A
Cited
US2588923A
Cited
US2502360A
Cited
US2538636A
Cited
US2701095A
Cited
US2614169A
Cited
FR1033166A
Cited
US2790599A
Cited
US2739299A
Cited
US2787416A
Cited
US2769592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |