US3437073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for treating particulate material in a fluidized bed
Assignee: Wisconsin Alumni Research Foundation
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Filing: 1965-12-01
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Granted: 1969-04-08
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Expires: 1985-12-01
Abstract
No abstract record available.
Inventors
- 👤 Edwin George Drake
- 👤 Marius Frechette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:34
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/38; B01J8/384; B01J8/386; A; A23; A23B; A23B2/00; A23B2/40; A23B2/42; A23B2/425; A23L; A23L7/00; A23L7/10; A23L7/196; A23L7/1963; A23P; A23P10/00; A23P10/30; A23P20/00; A23P20/10; A23P20/105; A23P20/15; A23P20/18; B01J2/00; B01J2/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |