US2505249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and furnace for expanding perlite
Assignee: GREAT LAKES CARBON Corp
•
Filing: 1946-02-15
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Granted: 1950-04-25
•
Expires: 1966-02-15
Abstract
No abstract record available.
Inventors
- 👤 Wilbur E Johnson
- 👤 Armand R Bollaert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:42
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06; C04B20/061
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
THE METHOD OF PRODUCING LIGHT WEIGHT POWDERS FROM MINERALS OF THE PERLITE TYPE WHICH COMPRISES: COMMINUTING SAID MINERAL; ESTABLISHING A HORIZONTALLY FLOWING STREAM OF HOT COMBUSTION GASES; FEEDING A STREAM OF SAID COMMINUTED MINERAL INTO SAID HOT GAS STREAM AND THEREBY VESICULATING THE FINER PARTICLES OF SAID MINERAL WHILE IN SUSPENSION IN SAID GAS STREAM; PERMITTING LARGER AND INCOMPLETELY VESICULATED MINERAL PARTICLES TO SEPARATE FROM SAID STREAM; COLLECTING SAID SEPARATED PARTICLES AND RETURNING SAID COLLECTED PARTICLES INTO REPEATED CONTACCT WITH SAID HOT GASES, DOWNSTREAM FROM SAID FLAME UNTIL SAID PARTICLES ARE BROUGHT INTO SUSPENSION BY DECREPITATION AND VESICULATION, AND REMOVING FROM THE HEATING ZONE A STREAM OF COMBUSTION GASES HAVING ONLY VESICULATED MINERAL PARTICLES IN SUSPENSION.
Claim 2
Independent Claim
116 words
THE METHOD OF PRODUCING LIGHT WEIGHT POWDERS FROM MINERALS OF THE PERLITE TYPE WHICH COMPRISES: COMMINUTING SAID MINERAL; ESTABLISHING A HORIZONTALLY FLOWING STREAM OF HOT COMBUSTION GASES; FEEDING A STREAM OF SAID COMMINUTED MINERAL INTO SAID HOT GAS STREAM AND THEREBY VESICULATING THE FINER PARTICLES OF SAID MINERAL WHILE IN SUSPENSION IN SAID GAS STREAM; PERMITTING LARGER AND INCOMPLETELY VESICULATED MINERAL PARTICLES TO SEPARATE FROM SAID STREAM; COLLECTING SAID SEPARATED PARTICLES AND RETURNING SAID COLLECTED PARTICLES INTO REPEATED CONTACCT WITH SAID HOT GASES, DOWNSTREAM FROM SAID FLAME UNTIL SAID PARTICLES ARE BROUGHT INTO SUSPENSION BY DECREPITATION AND VESICULATION, AND REMOVING FROM THE HEATING ZONE A STREAM OF COMBUSTION GASES HAVING ONLY VESICULATED MINERAL PARTICLES IN SUSPENSION.
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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) | 1953-04-24 | 1953-10-24 | 1954-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-24 | 1957-10-24 | 1958-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-24 | 1961-10-24 | 1962-04-25 | $7700.00 | Window Closed / Lapsed |