US3411536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pilot operated control valve mechanism
Assignee: Koehring Co
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Filing: 1966-07-06
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Granted: 1968-11-19
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Expires: 1986-07-06
Abstract
No abstract record available.
Inventors
- 👤 Francis H Tennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:45
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/0401; F15B13/0405; F15B11/00; F15B11/006; F15B2211/00; F15B2211/30; F15B2211/305; F15B2211/3056; F15B2211/30565; F15B2211/30575; F15B2211/32; F15B2211/329; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/415; F15B2211/41563; F15B2211/4159; F15B2211/42; F15B2211/428; F15B2211/45; F15B2211/455; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7052; F15B2211/7053; F15B2211/75; F15B2211/77; F15B2211/7741; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87193; Y10T137/87201
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |