Patent US4133601A successfully refreshed from Google Patents.
US2188162A
Expired / Lapsed
US
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Sewage treatment
Assignee: Individual
•
Filing: 1938-02-21
•
Granted: 1940-01-23
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Expires: 1958-02-21
Abstract
No abstract record available.
Inventors
- 👤 Henry B Schulhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:34
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/10; C02F3/101; C02F3/06; 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) | 1943-01-22 | 1943-07-24 | 1944-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-01-22 | 1947-07-24 | 1948-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-01-22 | 1951-07-24 | 1952-01-23 | $7700.00 | Window Closed / Lapsed |