Patent US2530191A successfully refreshed from Google Patents.
US2530191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calculating apparatus
Assignee: —
•
Filing: —
•
Granted: 1950-11-14
•
Expires: 1967-11-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:50
CPC Classifications
G; G06; G06G; G06G1/00; G06G3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US786102A
Cited
US1067483A
Cited
US1068982A
Cited
US1387267A
Cited
US1645335A
Cited
US1777692A
Cited
US1667449A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-13 | 1954-05-15 | 1954-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-13 | 1958-05-15 | 1958-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-13 | 1962-05-15 | 1962-11-14 | $7700.00 | Window Closed / Lapsed |