US2855000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reverse flow valve
Assignee: Robertshaw Controls Co
•
Filing: 1955-02-16
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Granted: 1958-10-07
•
Expires: 1975-02-16
Abstract
No abstract record available.
Inventors
- 👤 Vincent K Van Allen
- 👤 David L Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:15
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/04; F16K11/00; F16K11/02; F16K11/06; F16K11/072; F16K11/074; F16K11/0743; F16K41/00; F16K41/10; F16K41/106; F25; F25B; F25B41/00; F25B41/20; F25B41/26; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86726; Y10T137/86839; Y10T137/86928; Y10T137/86936; Y10T137/86944; Y10T137/86968; Y10T137/86976; Y10T137/87016; Y10T137/8704
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US477398A
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US1644825A
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US1971187A
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US2202960A
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US2428410A
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US2659569A
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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) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |