US2536742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for treating perlite ore
Assignee: Individual
•
Filing: 1949-03-26
•
Granted: 1951-01-02
•
Expires: 1969-03-26
Abstract
No abstract record available.
Inventors
- 👤 Hammond Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:21
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06; C04B20/066
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
129 words
AN ORE TREATING FURNACE WHICH COMPRISES A CYLINDRICAL SHELL PORTION, A CONICAL SHELL PORTION FLUSH THEREWITH AT ONE END OF SAID SHELL PORTION AND HAVING A SMOOTH INNER WALL SURFACE, AN OUTLET CONDUIT FOR A SUSPENSION OF TREATED ORE IN GASEOUS COMBUSTION PRODUCTS AND ATTACHED TO THE OTHER END OF SAID SHELL PORTION, A COMBINATION BURNER AND ORE INLET ATTACHED TO AND OPENING INTO SAID CONICAL PORTION, SAID BURNER CONSISTING OF AN ELONGATED CENTRAL TUBE COAXIAL WITH SAID CYLINDRICAL AND CONICAL SHELL PORTIONS, AN ELONGATED DUCT COAXIAL AND SUBSTANTIALLY COEXTENSIVE WITH SAID CENTRAL TUBE AND SURROUNDING THE SAME, A FIRST ANNULAR CHAMBER COAXIAL WITH AND SURROUNDING A PORTION OF SAID DUCT, AN INLET CONDUIT FOR GASES OPENING INTO SAID FIRST CHAMBER, A PLURALITY OF SMALL UNIFORMLY SPACED HOLES PE-
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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) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |