US2499302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Evaporator
Assignee: Struthers Wells Corp
•
Filing: 1943-12-06
•
Granted: 1950-02-28
•
Expires: 1963-12-06
Abstract
No abstract record available.
Inventors
- 👤 Fred W Emhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:33
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/04; B01D1/02; Y; Y10; Y10S; Y10S159/00; Y10S159/04; Y10S159/41; Y10S159/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US519969A
Cited
US751998A
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US807586A
Cited
US1028086A
Cited
US1131738A
Cited
US1253411A
Cited
US1166539A
Cited
US1420366A
Cited
US1439278A
Cited
US1781764A
Cited
GB528890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-27 | 1953-08-29 | 1954-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-27 | 1957-08-29 | 1958-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-27 | 1961-08-29 | 1962-02-28 | $7700.00 | Window Closed / Lapsed |