Patent US3276380A successfully refreshed from Google Patents.
US3276380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil well shut-down device
Assignee: Individual
•
Filing: 1965-03-29
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Granted: 1966-10-04
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Expires: 1985-03-29
Abstract
No abstract record available.
Inventors
- 👤 John M Stevenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:20
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
IN AN ASSEMBLY FOR CONTAINING A FLUID FLOW THE COMBINATION COMPRISING, A PLURALITY OF CONCENTRIC TUBULAR MEANS, MEANS FOR POSITIONING SAID CONCENTRIC TUBULAR MEANS IN CONTACT WITH SAID FLUID FLOW, ELECTRICAL CONTROL MEANS POSITIONED WITHIN ONE OF SAID CONCENTRIC TUBULAR MEANS AND MEANS DEFINING UPPER AND LOWER OPENINGS IN SAID ONE OF SAID CONCENTRIC TUBULAR MEANS, AND MEANS FOR CREATING A DIFFERENTIAL PRESSURE BETWEEN SAID UPPER AND LOWER OPENINGS TO DIRECT SUBSTANTIALLY ALL OF SAID FLUID FLOW IN A COUNTER-DIRECTION THROUGH SAID ONE OF SAID CONCENTRIC TUBULAR MEANS.
Claim 2
Dependent Claim
88 words
IN AN ASSEMBLY FOR CONTAINING A FLUID FLOW THE COMBINATION COMPRISING, A PLURALITY OF CONCENTRIC TUBULAR MEANS, MEANS FOR POSITIONING SAID CONCENTRIC TUBULAR MEANS IN CONTACT WITH SAID FLUID FLOW, ELECTRICAL CONTROL MEANS POSITIONED WITHIN ONE OF SAID CONCENTRIC TUBULAR MEANS AND MEANS DEFINING UPPER AND LOWER OPENINGS IN SAID ONE OF SAID CONCENTRIC TUBULAR MEANS, AND MEANS FOR CREATING A DIFFERENTIAL PRESSURE BETWEEN SAID UPPER AND LOWER OPENINGS TO DIRECT SUBSTANTIALLY ALL OF SAID FLUID FLOW IN A COUNTER-DIRECTION THROUGH SAID ONE OF SAID CONCENTRIC TUBULAR MEANS.
References Cited (Backward Citations)
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US2675757A
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US1621354A
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US2203577A
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US2316494A
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US3112646A
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US3105443A
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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) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |