Patent US2660822A successfully refreshed from Google Patents.
US2660822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grading marker
Assignee: —
•
Filing: —
•
Granted: 1953-12-01
•
Expires: 1970-12-01
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:35
CPC Classifications
G; G01; G01C; G01C5/00; Y; Y10; Y10S; Y10S116/00; Y10S116/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US813872A
Cited
US1337586A
Cited
US1727806A
Cited
US1976264A
Cited
US1875137A
Cited
GB430354A
Cited
US2181977A
Cited
US2525644A
Cited
US2523255A
Cited
GB813872A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |