US2531879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gaseous current spray drier
Assignee: Drying & Concentrating Co
•
Filing: 1945-04-16
•
Granted: 1950-11-28
•
Expires: 1965-04-16
Abstract
No abstract record available.
Inventors
- 👤 Joseph M Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:21
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/16; B01D1/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US32222A
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US1288126A
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US1964858A
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US1939364A
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US2033470A
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US2047699A
Cited
US2074818A
Cited
FR845701A
Cited
US2217547A
Cited
US2367770A
Cited
US2469553A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |