Patent US3507620A successfully refreshed from Google Patents.
US3507620A
Expired / Lapsed
US
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Method for tracing the flow of water in subterranean formations
Assignee: Union Oil Company of California
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Filing: 1967-10-03
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Granted: 1970-04-21
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Expires: 1987-10-03
Abstract
No abstract record available.
Inventors
- 👤 John A Gurney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:07
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/10; E21B47/11; G; G01; G01C; G01C13/00; G01C13/002; G01C13/006; Y; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/173845; Y10T436/20; Y10T436/203332
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) | 1973-04-20 | 1973-10-20 | 1974-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-20 | 1977-10-20 | 1978-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-20 | 1981-10-20 | 1982-04-21 | $7700.00 | Window Closed / Lapsed |