US2974731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined impeller and closure
Assignee: Individual
•
Filing: 1958-06-02
•
Granted: 1961-03-14
•
Expires: 1978-06-02
Abstract
No abstract record available.
Inventors
- 👤 Emil A Mader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:40
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/34; F04D29/36; F04D29/362; F04D29/364
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1036834A
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US1658857A
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US2132133A
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US2383001A
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US2383004A
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US2656971A
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US2673681A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-13 | 1964-09-12 | 1965-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-13 | 1968-09-12 | 1969-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-13 | 1972-09-12 | 1973-03-14 | $7700.00 | Window Closed / Lapsed |