Patent US3498056A successfully refreshed from Google Patents.
US3498056A
Expired / Lapsed
US
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Pressurizing and drain valve
Assignee: Avco Corp
•
Filing: 1968-04-03
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Granted: 1970-03-03
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Expires: 1988-04-03
Abstract
No abstract record available.
Inventors
- 👤 Paul A Avery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:17
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/22; F02C7/232; F05; F05D; F05D2260/00; F05D2260/60; F05D2260/602; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/2557
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2619162A
Cited
US2488949A
Cited
US2712218A
Cited
US2837148A
Cited
US2929394A
Cited
US2963082A
Cited
US3419030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |