US3452873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aerator for sewage treatment systems
Assignee: Fairfield Engineering and Manufacturing Co
•
Filing: 1967-07-24
•
Granted: 1969-07-01
•
Expires: 1987-07-24
Abstract
No abstract record available.
Inventors
- 👤 Ronald S Blough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:38
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/14; C02F3/18; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/234; B01F23/2342; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB189700262A
Cited
GB190902113A
Cited
US1803792A
Cited
US3198000A
Cited
US3336016A
Cited
US3322410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |