US2594433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage treatment
Assignee: Selas Corp of America
•
Filing: 1946-06-20
•
Granted: 1952-04-29
•
Expires: 1966-06-20
Abstract
No abstract record available.
Inventors
- 👤 Frederic O Hess
- 👤 Marcus B Tark
- 👤 Edwin R Schofield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:56
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/28; Y; Y10; Y10S; Y10S159/00; Y10S159/905
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-29 | 1955-10-29 | 1956-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-29 | 1959-10-29 | 1960-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-29 | 1963-10-29 | 1964-04-29 | $7700.00 | Window Closed / Lapsed |