US2827604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Null detecting system for pendulums and similar devices
Assignee: NORTH AMERICAN GEOPHYSICAL CO
•
Filing: 1956-12-11
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Granted: 1958-03-18
•
Expires: 1976-12-11
Abstract
No abstract record available.
Inventors
- 👤 Raymond T Cloud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:54
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/20; G01D5/22; G01D5/225; G01D5/2275
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2517556A
Cited
US2697214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-17 | 1961-09-16 | 1962-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-17 | 1965-09-16 | 1966-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-17 | 1969-09-16 | 1970-03-18 | $7700.00 | Window Closed / Lapsed |