Patent US4537801A successfully refreshed from Google Patents.
Patent US2633346A successfully refreshed from Google Patents.
US2633346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace for producing physical and chemical changes in granular materials
Assignee: Individual
•
Filing: 1950-06-01
•
Granted: 1953-03-31
•
Expires: 1970-06-01
Abstract
No abstract record available.
Inventors
- 👤 Herbert A Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:28
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/14; B; B01; B01J; B01J6/00; B01J6/001; B01J6/002; C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06; C04B20/061
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |