US3436720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sonar apparatus for measuring underground caverns
Assignee: SONAR & WELL TESTING SERVICES Inc ("SONAR")
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Filing: 1966-10-10
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Granted: 1969-04-01
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Expires: 1986-10-10
Abstract
No abstract record available.
Inventors
- 👤 Gerald D Patterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:44
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/88; G01S15/89; G01S15/8906; G01S15/8934; G01S15/8938; G01S15/894; G01S7/00; G01S7/52; G01S7/52004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-31 | 1972-09-30 | 1973-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-31 | 1976-09-30 | 1977-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-31 | 1980-09-30 | 1981-04-01 | $7700.00 | Window Closed / Lapsed |