Patent US2572484A successfully refreshed from Google Patents.
US2572484A
Expired / Lapsed
US
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Apparatus for expanding perlite and the like
Assignee: HOWLE
•
Filing: 1947-09-17
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Granted: 1951-10-23
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Expires: 1967-09-17
Abstract
No abstract record available.
Inventors
- 👤 Ernest O Howle
- 👤 Roger W Jackson
- 👤 Norman M Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:53
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06; C04B20/066
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
APPARATUS FOR EXPANDING MINERAL COMPRISING IN COMBINATION A CYLINDRICAL SHEET METAL EXPANDING CHAMBER, A SUPPORT FOR SUSPENDING SAID CHAMBER FROM A POINT ADJACENT ITS TOP SO THAT IT HANGS FREELY FROM ITS SUPPORT FOR SUSPENDING SAID DUCING BURNING GASEOUS FUEL INTO SAID CHAMBER TO PROVIDE AN EXPANDING ZONE HEATED TO TEMPERATURES SUFFICIENT TO EXPAND SAID MINERALS, A MINERAL FEEDER FOR INTRODUCING MINERAL TO BE EXPANDED INTO SAID HIGH TEMPERATURE ZONE, AND MECHANISM FOR PERIODICALLY DELIVERING A BLOW TO SAID METAL WALLS TO DISLODGE MINERAL MATERIAL ADHERING THERETO.
Claim 2
Dependent Claim
87 words
APPARATUS FOR EXPANDING MINERAL COMPRISING IN COMBINATION A CYLINDRICAL SHEET METAL EXPANDING CHAMBER, A SUPPORT FOR SUSPENDING SAID CHAMBER FROM A POINT ADJACENT ITS TOP SO THAT IT HANGS FREELY FROM ITS SUPPORT FOR SUSPENDING SAID DUCING BURNING GASEOUS FUEL INTO SAID CHAMBER TO PROVIDE AN EXPANDING ZONE HEATED TO TEMPERATURES SUFFICIENT TO EXPAND SAID MINERALS, A MINERAL FEEDER FOR INTRODUCING MINERAL TO BE EXPANDED INTO SAID HIGH TEMPERATURE ZONE, AND MECHANISM FOR PERIODICALLY DELIVERING A BLOW TO SAID METAL WALLS TO DISLODGE MINERAL MATERIAL ADHERING THERETO.
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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) | 1954-10-22 | 1955-04-23 | 1955-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-22 | 1959-04-23 | 1959-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-22 | 1963-04-23 | 1963-10-23 | $7700.00 | Window Closed / Lapsed |