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US2550984A
Expired / Lapsed
US
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Valve
Assignee: Individual
•
Filing: 1948-08-02
•
Granted: 1951-05-01
•
Expires: 1968-08-02
Abstract
No abstract record available.
Inventors
- 👤 Robert E Ferguson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:17
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/0209; F16K3/0281; Y; Y10; Y10T; Y10T137/00; Y10T137/4238; Y10T137/4245; Y10T137/4273; Y10T137/4336
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US333492A
Cited
US534360A
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US1348993A
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US1756615A
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US2001271A
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US2002965A
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US2000853A
Cited
US2064567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |