US2479688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve disk
Assignee: Weatherhead Co
•
Filing: 1944-05-25
•
Granted: 1949-08-23
•
Expires: 1964-05-25
Abstract
No abstract record available.
Inventors
- 👤 George O R Lindgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:31
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/32; F16K1/34; F16K1/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US450767A
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US560695A
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US600360A
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US625954A
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US1780562A
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US1303763A
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US1602236A
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US2111430A
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US2213259A
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US2192339A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-22 | 1953-02-21 | 1953-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-22 | 1957-02-21 | 1957-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-22 | 1961-02-21 | 1961-08-23 | $7700.00 | Window Closed / Lapsed |