US2998099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas impeller and conditioning apparatus
Assignee: Individual
•
Filing: 1957-11-20
•
Granted: 1961-08-29
•
Expires: 1977-11-20
Abstract
No abstract record available.
Inventors
- 👤 Hollingsworth R Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:18
CPC Classifications
F; F03; F03B; F03B5/00; F24; F24F; F24F6/00; F24F6/02; F24F6/06; Y; Y02; Y02E; Y02E10/00; Y02E10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB190810442A
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US951452A
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FR609180A
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US1927376A
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GB396648A
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US2036929A
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GB438694A
Cited
US2433325A
Cited
US2426328A
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US2587197A
Cited
FR1034841A
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US2922489A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |