US3142756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photomultiplier tube with tubular cathode bonded to the interior surface thereof
Assignee: Schlumberger Well Surveying Corp
•
Filing: 1959-11-23
•
Granted: 1964-07-28
•
Expires: 1979-11-23
Abstract
No abstract record available.
Inventors
- 👤 Goodman Clark
- 👤 Causse Jean-Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:16
CPC Classifications
G; G01; G01T; G01T3/00; G01T3/06; G01V; G01V5/00; G01V5/04; G01V5/08; G01V5/10; G01V5/104
Claims Analysis
Total Claims: 0
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US2971094A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-28 | 1968-01-27 | 1968-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-28 | 1972-01-27 | 1972-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-28 | 1976-01-27 | 1976-07-28 | $7700.00 | Window Closed / Lapsed |