US3491789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bellows valve
Assignee: Nupro Co
•
Filing: 1966-07-28
•
Granted: 1970-01-27
•
Expires: 1986-07-28
Abstract
No abstract record available.
Inventors
- 👤 Francis J Callahan Jr
- 👤 Bernard J Gallagher
- 👤 Earl D Shufflebarger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:23
CPC Classifications
F; F16; F16K; F16K49/00; F16K49/005; F16K51/00; F16K51/02; Y; Y10; Y10T; Y10T137/00; Y10T137/6416; Y10T137/6579
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2704650A
Cited
US2848187A
Cited
US3101094A
Cited
US1825378A
Cited
US2444703A
Cited
US2973179A
Cited
US3070117A
Cited
US3206165A
Cited
US3280836A
Cited
US3326512A
Cited
US3278156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-26 | 1973-07-28 | 1974-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-26 | 1977-07-28 | 1978-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-26 | 1981-07-28 | 1982-01-27 | $7700.00 | Window Closed / Lapsed |