US3531404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage treatment system
Assignee: Smith and Loveless Inc
•
Filing: 1968-04-01
•
Granted: 1970-09-29
•
Expires: 1988-04-01
Abstract
No abstract record available.
Inventors
- 👤 Brian L Goodman
- 👤 Robert M Appleberry
- 👤 John W Struewing
- 👤 Frank G Weis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:06
CPC Classifications
C; C02; C02F; C02F11/00; C02F11/12; C02F11/121; C02F11/123; B; B01; B01D; B01D33/00; B01D33/04; B01D33/44; B01D33/46; B01D33/463
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB222221A
Cited
US2021122A
Cited
US1958279A
Cited
US2097529A
Cited
US2798609A
Cited
US2848113A
Cited
US3053392A
Cited
US3200949A
Cited
US3117927A
Cited
US3259570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |