US3385216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for regulating the air volume in a water system
Assignee: Individual
•
Filing: 1965-10-22
•
Granted: 1968-05-28
•
Expires: 1985-10-22
Abstract
No abstract record available.
Inventors
- 👤 James H Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:40
CPC Classifications
G; G05; G05D; G05D9/00; G05D9/04; F; F04; F04D; F04D13/00; F04D13/16; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3115; Y10T137/3127
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA460038A
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US2704632A
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US1661886A
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US1941766A
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US2183421A
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US2822121A
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US3053435A
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US3133501A
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US3259067A
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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) | 1971-05-28 | 1971-11-27 | 1972-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-28 | 1975-11-27 | 1976-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-28 | 1979-11-27 | 1980-05-28 | $7700.00 | Window Closed / Lapsed |