US2812995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct depth recorder
Assignee: Individual
•
Filing: 1954-03-17
•
Granted: 1957-11-12
•
Expires: 1974-03-17
Abstract
No abstract record available.
Inventors
- 👤 John A Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:33
CPC Classifications
F; F42; F42B; F42B19/00; G; G01; G01C; G01C13/00; G01C13/008; G01D; G01D15/00; G01D15/14; Y; Y10; Y10S; Y10S116/00; Y10S116/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US737298A
Cited
US1426735A
Cited
US1490223A
Cited
US2258700A
Cited
US2377182A
Cited
GB614746A
Cited
US2469115A
Cited
US2618195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-11 | 1961-05-13 | 1961-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-11 | 1965-05-13 | 1965-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-11 | 1969-05-13 | 1969-11-12 | $7700.00 | Window Closed / Lapsed |