Patent US1987501A successfully refreshed from Google Patents.
US1987501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pool aerator
Assignee: Individual
•
Filing: 1933-09-01
•
Granted: 1935-01-08
•
Expires: 1953-09-01
Abstract
No abstract record available.
Inventors
- 👤 Charles H Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:06
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/24; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/234; Y; Y02; Y02W; Y02W10/00; Y02W10/10
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) | 1938-01-07 | 1938-07-09 | 1939-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-01-07 | 1942-07-09 | 1943-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-01-07 | 1946-07-09 | 1947-01-08 | $7700.00 | Window Closed / Lapsed |