US3421733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve having pressure actuated seats
Assignee: ACF Industries Inc
•
Filing: 1967-10-16
•
Granted: 1969-01-14
•
Expires: 1987-10-16
Abstract
No abstract record available.
Inventors
- 👤 Joseph T Stewart Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:56
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/06; F16K5/00; F16K5/06; F16K5/0663; F16K5/0673
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3047265A
Cited
US3379410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |