US2800142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure regulating and check valve
Assignee: AV Roe Canada Ltd
•
Filing: 1954-11-15
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Granted: 1957-07-23
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Expires: 1974-11-15
Abstract
No abstract record available.
Inventors
- 👤 Champion Alexander Osmond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:28
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/04; G05D16/10; G05D16/103; F; F16; F16K; F16K15/00; F16K15/02; F16K15/025; F16K15/026; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7937
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-22 | 1961-01-21 | 1961-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-22 | 1965-01-21 | 1965-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-22 | 1969-01-21 | 1969-07-23 | $7700.00 | Window Closed / Lapsed |