US2997273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid handling valve
Assignee: Individual
•
Filing: 1957-08-13
•
Granted: 1961-08-22
•
Expires: 1977-08-13
Abstract
No abstract record available.
Inventors
- 👤 Norman P Nilsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:39
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/04; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86509; Y10T137/86517; Y10T137/86533; Y10T137/86831
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1121140A
Cited
US1490150A
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US2089943A
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US2302061A
Cited
US2584161A
Cited
US2561559A
Cited
US2583869A
Cited
US2582752A
Cited
US2661019A
Cited
US2809011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |