US2930401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poppet valve construction
Assignee: Bobrick Manufacturing Corp
•
Filing: 1956-11-16
•
Granted: 1960-03-29
•
Expires: 1976-11-16
Abstract
No abstract record available.
Inventors
- 👤 Arnold A Cowan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:44
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/025; F16K15/06; F16K15/063; Y; Y10; Y10S; Y10S417/00; Y10S417/01; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7938
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US240754A
Cited
US1775090A
Cited
GB606623A
Cited
US2717757A
Cited
US2768643A
Cited
US2711186A
Cited
US2701119A
Cited
US2687277A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |