US2709451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balanced duplex valve head and seat member
Assignee: Individual
•
Filing: 1952-07-26
•
Granted: 1955-05-31
•
Expires: 1972-07-26
Abstract
No abstract record available.
Inventors
- 👤 Bour Harry E La
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:48
CPC Classifications
F; F16; F16K; F16K39/00; F16K39/02; F16K39/022; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86759; Y10T137/86767; Y10T137/86775
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CH20966A
Cited
AT31486B
Cited
US862130A
Cited
US1126537A
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US1299130A
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US1860468A
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DE637534C
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US2290527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-30 | 1958-11-29 | 1959-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-30 | 1962-11-29 | 1963-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-30 | 1966-11-29 | 1967-05-31 | $7700.00 | Window Closed / Lapsed |