Patent US2797704A successfully refreshed from Google Patents.
US2797704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve
Assignee: Individual
•
Filing: 1953-02-04
•
Granted: 1957-07-02
•
Expires: 1973-02-04
Abstract
No abstract record available.
Inventors
- 👤 John J Mcdermott
- 👤 Bodnar Alex
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:37
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/06; F16K15/063; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7937; Y10T29/00; Y10T29/49; Y10T29/49405; Y10T29/49407; Y10T29/49826; Y10T29/49908; Y10T29/49915; Y10T29/49917; Y10T29/49918
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US344202A
Cited
US347947A
Cited
US2202211A
Cited
US964615A
Cited
US2147244A
Cited
US2085360A
Cited
GB489602A
Cited
US2223994A
Cited
US2357657A
Cited
US2358228A
Cited
US2481713A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |