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Patent US2820604A successfully refreshed from Google Patents.
US2820604A
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US
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Valve with adjustable opening
Assignee: General Controls Co
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Filing: 1954-04-12
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Granted: 1958-01-21
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Expires: 1974-04-12
Abstract
No abstract record available.
Inventors
- 👤 William A Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:35
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/0644; F16K31/0655; F16K31/0658
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1185970A
Cited
US1999221A
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US1970546A
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US2195764A
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US2272115A
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US2331503A
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US2640726A
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US2676037A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |