Patent US2605637A successfully refreshed from Google Patents.
US2605637A
Expired / Lapsed
US
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Surveying of subsurface water tables
Assignee: Individual
•
Filing: 1949-07-28
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Granted: 1952-08-05
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Expires: 1969-07-28
Abstract
No abstract record available.
Inventors
- 👤 Earle D Rhoades
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:09
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B47/00; E21B47/04; E21B47/047
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) | 1955-08-05 | 1956-02-04 | 1956-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-05 | 1960-02-04 | 1960-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-05 | 1964-02-04 | 1964-08-05 | $7700.00 | Window Closed / Lapsed |