US3521853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Throttle and shutoff valve
Assignee: THOMAS S GILLIS JR
•
Filing: 1966-12-12
•
Granted: 1970-07-28
•
Expires: 1986-12-12
Abstract
No abstract record available.
Inventors
- 👤 Thomas S Gillis Jr
- 👤 John W Pennington
- 👤 Elry C Bird
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:24
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/02; E21B34/025; F; F16; F16K; F16K47/00; F16K47/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US608342A
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US717437A
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US795715A
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US971162A
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GB201809A
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US1588645A
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US1777261A
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US1962558A
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US2117182A
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US2387792A
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US2454160A
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US2847183A
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US2918087A
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US3044743A
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US3059894A
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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) | 1973-07-27 | 1974-01-26 | 1974-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-27 | 1978-01-26 | 1978-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-27 | 1982-01-26 | 1982-07-28 | $7700.00 | Window Closed / Lapsed |