US3233740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High flow rate perlite filter aids
Assignee: Johns Manville Corp
•
Filing: 1961-06-02
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Granted: 1966-02-08
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Expires: 1981-06-02
Abstract
No abstract record available.
Inventors
- 👤 Linden Carl R Vander
- 👤 Raymond G Riede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:00
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/103; B01J20/106; B01D; B01D39/00; B01D39/02; B01D39/06; C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A METHOD OF PRODUCING LIGHT WEIGHT PERLITE PRODUCTS COMPRISING ROLLING AND TUMBLINB PERLITE OR HAVING A CHEMICAL COMPOSITION ON A MOISTURE-FREE BASIS COMPRISING IN APPROXIMATE PERCENTAGES BY WEIGHT 71-75% SIO2, 12.5-18% AL2O3, 2.9-4% NA2O, AND 4-5% K2O THROUGH A SUBSTANTIALLY HORIZONTAL PATH, SAID ORE HAVING A PARTICLE SIZE DISTRIBUTION OF BETWEEN ABOUT 30 AND ABOUT 100 MESH, HEATING THE ORE WHILE TRAVELING THROUGH SAID PATH TO APPROXIMATELY THE POINT OF INCIPIENT FUSION OF SAID ORE AND BETWEEN ABOUT 1600* AND ABOUT 2000*F. TO EXPAND
Claim 2
Independent Claim
84 words
A METHOD OF PRODUCING LIGHT WEIGHT PERLITE PRODUCTS COMPRISING ROLLING AND TUMBLINB PERLITE OR HAVING A CHEMICAL COMPOSITION ON A MOISTURE-FREE BASIS COMPRISING IN APPROXIMATE PERCENTAGES BY WEIGHT 71-75% SIO2, 12.5-18% AL2O3, 2.9-4% NA2O, AND 4-5% K2O THROUGH A SUBSTANTIALLY HORIZONTAL PATH, SAID ORE HAVING A PARTICLE SIZE DISTRIBUTION OF BETWEEN ABOUT 30 AND ABOUT 100 MESH, HEATING THE ORE WHILE TRAVELING THROUGH SAID PATH TO APPROXIMATELY THE POINT OF INCIPIENT FUSION OF SAID ORE AND BETWEEN ABOUT 1600* AND ABOUT 2000*F. TO EXPAND
References Cited (Backward Citations)
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Cited
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Cited
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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) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |