US3567372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic crystalline zeolite
Assignee: WR Grace and Co
•
Filing: 1968-07-15
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Granted: 1971-03-02
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Expires: 1988-07-15
Abstract
Abstract A SYNTHETIC ZEOLITE HAVING A PORE DIAMETER OF 17 ANGSTROMS HAVING A DIAMOND TYPE CUBIC CRYSTAL WITH LATTICE SPACING D111=21.1$0.2 ANGSTROMS AND A UNIT CELL OF A0=36.7$0.3 ANGSTROMS, PREPARED FROM ALUMINATE AND SILICATE SOLUTIONS IN THE PRESENCE OF VARYING AMOUNTS OF SODIUM HYDROXIDE.
Inventors
- 👤 Heyman Clarke Duecker
- 👤 Armin Weiss
- 👤 Carlos R Guerra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:03
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; C01B33/2869
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |