US1892688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage treating apparatus
Assignee: Dorr Co
•
Filing: 1931-06-09
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Granted: 1933-01-03
•
Expires: 1951-06-09
Abstract
No abstract record available.
Inventors
- 👤 Clarence E Keefer
- 👤 Frank C Wachter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:59
CPC Classifications
C; C02; C02F; C02F11/00; C02F11/02; C02F11/04; C02F3/00; C02F3/28; C12; C12M; C12M21/00; C12M21/04; C12M23/00; C12M23/02; C12M23/18; C12M27/00; C12M27/02
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) | 1936-01-03 | 1936-07-04 | 1937-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-01-03 | 1940-07-04 | 1941-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-01-03 | 1944-07-04 | 1945-01-03 | $7700.00 | Window Closed / Lapsed |