US2072944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aerator
Assignee: Chicago Pump Co
•
Filing: 1934-12-21
•
Granted: 1937-03-09
•
Expires: 1954-12-21
Abstract
No abstract record available.
Inventors
- 👤 Augustus C Durdin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:38
CPC Classifications
B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/234; B01F23/2342; B01F23/23421; C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/14; C02F3/16; C02F3/165; B01F23/237; B01F23/2376; B01F23/23761; B01F2101/00; B01F2101/305; B01F27/00; B01F27/05; B01F27/11; B01F27/114; B01F27/1143; B01F27/15; B01F27/80; B01F35/00; B01F35/30; B01F35/32; B01F35/321; B01F35/3214; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S261/00; Y10S261/71
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1940-03-08 | 1940-09-07 | 1941-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-03-08 | 1944-09-07 | 1945-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-03-08 | 1948-09-07 | 1949-03-09 | $7700.00 | Window Closed / Lapsed |