US2700755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyboard checking circuit
Assignee: Monroe Calculating Machine Co
•
Filing: 1951-11-09
•
Granted: 1955-01-25
•
Expires: 1971-11-09
Abstract
No abstract record available.
Inventors
- 👤 William H Burkhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:56
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/14; G06F11/1497; H; H03; H03M; H03M11/00; H03M11/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2410669A
Cited
US2539043A
Cited
GB595556A
Cited
US2393386A
Cited
US2532546A
Cited
US2580768A
Cited
US2599392A
Cited
US2514054A
Cited
US2572132A
Cited
US2611026A
Cited
US2573356A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-24 | 1958-07-26 | 1959-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-24 | 1962-07-26 | 1963-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-24 | 1966-07-26 | 1967-01-25 | $7700.00 | Window Closed / Lapsed |