US2775983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible diaphragm having a trough
Assignee: Rockwell Manufacturing Co
•
Filing: 1951-12-27
•
Granted: 1957-01-01
•
Expires: 1971-12-27
Abstract
No abstract record available.
Inventors
- 👤 Charles B Johnson
- 👤 Robert J Sarraf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:46
CPC Classifications
F; F16; F16J; F16J3/00; F16J3/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US768984A
Cited
US1515702A
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US1790206A
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GB317534A
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US2033354A
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GB461857A
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US2130948A
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US2334496A
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US2307066A
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US2447261A
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US2405038A
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US2422529A
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US2578730A
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US2444163A
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US2564693A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-01 | 1960-07-02 | 1961-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-01 | 1964-07-02 | 1965-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-01 | 1968-07-02 | 1969-01-01 | $7700.00 | Window Closed / Lapsed |