Patent US3228467A successfully refreshed from Google Patents.
Patent US2934086A successfully refreshed from Google Patents.
US2934086A
Expired / Lapsed
US
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Vacuumatic valve
Assignee: Individual
•
Filing: 1958-04-16
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Granted: 1960-04-26
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Expires: 1978-04-16
Abstract
No abstract record available.
Inventors
- 👤 Leland F Blatt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:55
CPC Classifications
F; F04; F04F; F04F5/00; F04F5/44; F04F5/48; F04F5/52; F04F5/14; F04F5/16; F04F5/20; Y; Y10; Y10T; Y10T137/00; Y10T137/8376; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/87153; Y10T137/87917; Y10T137/88038
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2280658A
Cited
US2803110A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |