Patent US4680675A successfully refreshed from Google Patents.
US2863653A
Expired / Lapsed
US
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Apparatus for introducing gas into water
Assignee: Individual
•
Filing: 1957-05-08
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Granted: 1958-12-09
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Expires: 1977-05-08
Abstract
No abstract record available.
Inventors
- 👤 Charles R Cummings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:00
CPC Classifications
B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/233; B01F23/2334; B01F23/23342
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1124853A
Cited
US1374445A
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US2189779A
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US2352767A
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US2590581A
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US2725062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |