Patent US2637541A successfully refreshed from Google Patents.
US2637541A
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US
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Device for distributing air, gas, or the like in liquids
Assignee: Individual
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Filing: 1951-02-28
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Granted: 1953-05-05
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Expires: 1971-02-28
Abstract
No abstract record available.
Inventors
- 👤 Rubin Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:34
CPC Classifications
A; A01; A01K; A01K63/00; A01K63/04; A01K63/042; A61; A61H; A61H33/00; A61H33/02; A61H33/025; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/231; B01F23/23105; B01F23/2312; B01F23/23123; B01F23/23126; B01F23/231261; B01F23/231265; B01F23/231231
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |