US2988274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calculating machines
Assignee: Individual
•
Filing: 1958-02-18
•
Granted: 1961-06-13
•
Expires: 1978-02-18
Abstract
No abstract record available.
Inventors
- 👤 Carlsen Henning Gunnar
- 👤 Carlsen Erling Adolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:32
CPC Classifications
G; G06; G06C; G06C7/00; G06C7/02; G06C7/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1889023A
Cited
US2274049A
Cited
US2581624A
Cited
US2749033A
Cited
US1386996A
Cited
US1707303A
Cited
US1637211A
Cited
US2628776A
Cited
US2614841A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |