US3758539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Offretite synthesis from minerals
Assignee: Air Products and Chemicals Inc
•
Filing: 1971-03-09
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Granted: 1973-09-11
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Expires: 1991-03-09
Abstract
Abstract A synthetic offretite having a capacity for sorbing benzene and other large molecules is prepared from an aqueous nutrient containing tetramethyl ammonium hydroxide, potassium hydroxide, and a suitable mixture of reactive aluminosilicate minerals, usually comprising sorptive silica.
Inventors
- 👤 W Flank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:36
CPC Classifications
C; C10; C10G; C10G47/00; C10G47/02; C10G47/10; C10G47/12; C10G47/16; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/50; B01J29/52; B01J29/54; C01; C01B; C01B39/00; C01B39/02; C01B39/30; C01B39/305; C10G11/00; C10G11/02; C10G11/04; C10G11/05; B01J2229/00; B01J2229/30; B01J2229/36; Y; Y10; Y10S; Y10S423/00; Y10S423/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
28 words
The method of claim 1 in which the molar unit ratio of potassium hydroxide to tetramethyl ammonium hydroxide is within a range from about 2.0 to about 2.8.
Claim 2
Dependent Claim
23 words
The method of claim 2 in which the unit mol ratio of water to total alkali is from about 12 to about 18.
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |