US2812592A
Expired / Lapsed
US
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Heat treatment of finely-divided solids
Assignee: Fawkham Developments Ltd
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Filing: 1955-11-14
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Granted: 1957-11-12
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Expires: 1975-11-14
Abstract
No abstract record available.
Inventors
- 👤 Knibbs Norman Victor Sydney
- 👤 Thyer Edward George Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:12
CPC Classifications
F; F28; F28C; F28C3/00; F28C3/10; F28C3/12; F28C3/16; B; B01; B01J; B01J6/00; B01J6/001; B01J6/004; B01J8/00; B01J8/18; B01J8/24; B01J8/44; C; C04; C04B; C04B11/00; C04B11/02; C04B11/028; C04B2/00; C04B2/10; C04B7/00; C04B7/36; C04B7/43; F27; F27B; F27B15/00
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) | 1960-11-11 | 1961-05-13 | 1961-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-11 | 1965-05-13 | 1965-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-11 | 1969-05-13 | 1969-11-12 | $7700.00 | Window Closed / Lapsed |