US2542041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid treatment apparatus
Assignee: STEARNS ROGER Manufacturing CO
•
Filing: 1943-10-22
•
Granted: 1951-02-20
•
Expires: 1963-10-22
Abstract
No abstract record available.
Inventors
- 👤 John E Mason
- 👤 Eliason Clarence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:03
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/16; B01D1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1905263A
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US2143191A
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US2208813A
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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) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |