US2861769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valves
Assignee: Individual
•
Filing: 1953-07-16
•
Granted: 1958-11-25
•
Expires: 1973-07-16
Abstract
No abstract record available.
Inventors
- 👤 Alfred F Schumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:05
CPC Classifications
F; F16; F16K; F16K5/00; F16K5/02; F16K5/0214; F16K5/0207; F23; F23D; F23D11/00; F23D11/24; Y; Y10; Y10T; Y10T137/00; Y10T137/8158; Y10T137/8225; Y10T137/8275; Y10T137/8292; Y10T137/8309
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE458554C
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US762936A
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US946228A
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DE412499C
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US1883727A
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FR737686A
Cited
US2351372A
Cited
US2424328A
Cited
US2449833A
Cited
US2494183A
Cited
FR1006998A
Cited
US2723102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |