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US2451631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined accounting machine and typewriter
Assignee: —
•
Filing: —
•
Granted: 1948-10-19
•
Expires: 1965-10-19
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:16
CPC Classifications
G; G06; G06F; G06F15/00; G06F15/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1357423A
Cited
US1819084A
Cited
US1939804A
Cited
US2079355A
Cited
US2313982A
Cited
US2084445A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-19 | 1952-04-19 | 1952-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-19 | 1956-04-19 | 1956-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-19 | 1960-04-19 | 1960-10-19 | $7700.00 | Window Closed / Lapsed |