Patent US1327777A successfully refreshed from Google Patents.
US2661899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic calculator
Assignee: Individual
•
Filing: 1946-07-12
•
Granted: 1953-12-08
•
Expires: 1966-07-12
Abstract
No abstract record available.
Inventors
- 👤 Benjamin J Chromy
- 👤 Philip H Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:29
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/48; G06F7/491; G06F7/498; G06F7/4983; G06F7/4985
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-07 | 1957-06-08 | 1957-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-07 | 1961-06-08 | 1961-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-07 | 1965-06-08 | 1965-12-08 | $7700.00 | Window Closed / Lapsed |