US3439873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bi-directional pressure relief valve
Assignee: VICTOR ENTERPRISES Ltd
•
Filing: 1967-03-17
•
Granted: 1969-04-22
•
Expires: 1987-03-17
Abstract
No abstract record available.
Inventors
- 👤 Victor K Relf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:46
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/12; F24H9/13; F24H9/133; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1797; Y10T137/1804; Y10T137/7722; Y10T137/7771; Y10T137/778; Y10T137/7781; Y10T137/7834
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US770043A
Cited
US2589072A
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US2674268A
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US2785861A
Cited
US2747594A
Cited
US2986159A
Cited
US3108610A
Cited
US3216608A
Cited
US3304952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |