US3525978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional seismic sensing system
Assignee: SENSOR PRECISION IND Inc
•
Filing: 1967-11-13
•
Granted: 1970-08-25
•
Expires: 1987-11-13
Abstract
No abstract record available.
Inventors
- 👤 William J Heinecke
- 👤 Gunars Grabis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:50
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/16; G01V1/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE25902E
Cited
US2972733A
Cited
US3109165A
Cited
US3063034A
Cited
US3261009A
Cited
US3386076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-24 | 1974-02-23 | 1974-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-24 | 1978-02-23 | 1978-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-24 | 1982-02-23 | 1982-08-25 | $7700.00 | Window Closed / Lapsed |