Patent DE957897C successfully refreshed from Google Patents.
US3439899A
Expired / Lapsed
US
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Method for the production and control of fluidized beds
Assignee: Magneto Dynamics Inc
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Filing: 1967-02-27
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Granted: 1969-04-22
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Expires: 1987-02-27
Abstract
No abstract record available.
Inventors
- 👤 Abe Hershler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:10
CPC Classifications
B; B65; B65G; B65G54/00; B65G54/02; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/42; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/16
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) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |