US2594641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve
Assignee: HENRY VALVE Co Inc
•
Filing: 1946-08-29
•
Granted: 1952-04-29
•
Expires: 1966-08-29
Abstract
No abstract record available.
Inventors
- 👤 Leonard F Griffith
- 👤 Douglas K Mcilvaine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:16
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; Y10T137/7932; Y10T137/7933
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE460840C
Cited
US833559A
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GB190804129A
Cited
US1111319A
Cited
GB191509164A
Cited
US1668891A
Cited
US1948676A
Cited
US1963684A
Cited
AT155165B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-29 | 1955-10-29 | 1956-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-29 | 1959-10-29 | 1960-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-29 | 1963-10-29 | 1964-04-29 | $7700.00 | Window Closed / Lapsed |