US3534857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expandable aerotor plants for treatment of sewage and industrial wastes
Assignee: Lakeside Equipment Corp
•
Filing: 1968-09-09
•
Granted: 1970-10-20
•
Expires: 1988-09-09
Abstract
No abstract record available.
Inventors
- 👤 William L Berk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:54
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1236; C02F3/1257; C02F3/14; C02F3/18; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2901114A
Cited
US3047492A
Cited
GB970470A
Cited
US3295682A
Cited
US3312346A
Cited
US3341450A
Cited
US3415379A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |