Patent US2898303A successfully refreshed from Google Patents.
US2898303A
Expired / Lapsed
US
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Method of expanding perlite
Assignee: International Minerals and Chemical Corp
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Filing: 1956-08-09
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Granted: 1959-08-04
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Expires: 1976-08-09
Abstract
No abstract record available.
Inventors
- 👤 Harry H Houston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:28
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/103; B01J20/106; C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06; C04B20/068
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
IN THE PROCESS OF EXPANDING GROUND PERLITE ORE AT TEMPERATURE BETWEEN ABOUT 1500 AND 2100*F., THE IMPROVEMENT WHICH COMPRISES ADMIXING GROUND PERLITE ORE, PRIOR TO EXPANSION, WITH AN AQUEOUS MINERAL ACID SOLUTION TO FORM A SLURRY, SAID MINERAL ACID SOLUTION HAVING A CONCENTRATION BETWEEN ABOUT 0.05 AND ABOUT 0.6 MOLE OF ACID IN 100 GRAMS OF SOLUTION, WHEREBY THE PERLITE ORE IS ACITIVATED FOR THE EXPANSION STEP, SEPARATING THE ACTIVATED PERLITE ORE FROM THE ACID SOLUTION, AND DRYING THE ACTIVATED PERLITE ORE.
Claim 2
Dependent Claim
82 words
IN THE PROCESS OF EXPANDING GROUND PERLITE ORE AT TEMPERATURE BETWEEN ABOUT 1500 AND 2100*F., THE IMPROVEMENT WHICH COMPRISES ADMIXING GROUND PERLITE ORE, PRIOR TO EXPANSION, WITH AN AQUEOUS MINERAL ACID SOLUTION TO FORM A SLURRY, SAID MINERAL ACID SOLUTION HAVING A CONCENTRATION BETWEEN ABOUT 0.05 AND ABOUT 0.6 MOLE OF ACID IN 100 GRAMS OF SOLUTION, WHEREBY THE PERLITE ORE IS ACITIVATED FOR THE EXPANSION STEP, SEPARATING THE ACTIVATED PERLITE ORE FROM THE ACID SOLUTION, AND DRYING THE ACTIVATED PERLITE ORE.
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) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |