US2904252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic calculating apparatus for addition and subtraction
Assignee: International Computers and Tabulators Ltd
•
Filing: 1953-03-26
•
Granted: 1959-09-15
•
Expires: 1973-03-26
Abstract
No abstract record available.
Inventors
- 👤 Bird Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:37
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/48; G06F7/50; G06F7/504
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2643820A
Cited
US2719670A
Cited
US2600744A
Cited
US2646501A
Cited
US2655598A
Cited
US2580771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |