US2690303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Counter
Assignee: MARCHANT CALCULATORS Inc
•
Filing: 1951-04-03
•
Granted: 1954-09-28
•
Expires: 1971-04-03
Abstract
No abstract record available.
Inventors
- 👤 George V Nolde
- 👤 Clair Hal K St
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:22
CPC Classifications
H; H03; H03K; H03K23/00; H03K23/82
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2416793A
Cited
US2538122A
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US2461438A
Cited
US2536955A
Cited
US2552760A
Cited
US2521774A
Cited
US2514054A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |