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US2716230A
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US
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Keyboard checking alarm
Assignee: Monroe Calculating Machine Co
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Filing: 1952-11-08
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Granted: 1955-08-23
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Expires: 1972-11-08
Abstract
No abstract record available.
Inventors
- 👤 Walter S Oliwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:01
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/0703; G06F11/0751; G06F11/0754; H; H03; H03M; H03M11/00; H03M11/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2581218A
Cited
US2609143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-08-22 | 1959-02-21 | 1959-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-08-22 | 1963-02-21 | 1963-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-08-22 | 1967-02-21 | 1967-08-23 | $7700.00 | Window Closed / Lapsed |