US2668041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat treatment of finely divided solids
Assignee: Individual
•
Filing: 1950-03-14
•
Granted: 1954-02-02
•
Expires: 1970-03-14
Abstract
No abstract record available.
Inventors
- 👤 Knibbs Norman Victor Syndney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:47
CPC Classifications
F; F27; F27B; F27B1/00; F27B1/005; B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; F26; F26B; F26B3/00; F26B3/02; F26B3/06; F26B3/08
Claims Analysis
Total Claims: 0
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US2528098A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |