Patent EP0607468B1 successfully refreshed from Google Patents.
US2590581A
Expired / Lapsed
US
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Device for aerating water
Assignee: Individual
•
Filing: 1950-02-06
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Granted: 1952-03-25
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Expires: 1970-02-06
Abstract
No abstract record available.
Inventors
- 👤 Dwight W Shirley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:08
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/60; F04D29/601; F04D29/602; A; A01; A01K; A01K63/00; A01K63/04; A01K63/042; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/233; B01F23/2331; B01F23/2333; B01F23/2334; B01F23/23341; B01F23/40; B01F23/45; B01F23/454; B01F25/00; B01F25/40; B01F25/42; B01F25/43; B01F25/431; B01F25/4316; B01F25/45; B01F25/452; B01F25/4521; B01F25/45211; B01F23/23312; B01F23/2335; B01F23/23353; B01F23/2336; B01F23/23367; B01F27/00; B01F27/05; B01F27/07; B01F27/072; B01F27/0725; B01F27/11; B01F27/113; B01F27/60; B01F27/61
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) | 1955-03-25 | 1955-09-24 | 1956-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-25 | 1959-09-24 | 1960-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-25 | 1963-09-24 | 1964-03-25 | $7700.00 | Window Closed / Lapsed |