US3381750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for signaling the location of recesses in a flow conductor
Assignee: Otis Engineering Corp
•
Filing: 1965-10-21
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Granted: 1968-05-07
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Expires: 1985-10-21
Abstract
No abstract record available.
Inventors
- 👤 Norman F Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:21
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3126058A
Cited
US2741316A
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US2999542A
Cited
US3061010A
Cited
US3166128A
Cited
US3924278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |