US3537816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for reducing the alkali metal content of faujasite type crystalline zeolites
Assignee: KONINKL ZWAVELZUURFABRIEKEN V
•
Filing: 1968-09-27
•
Granted: 1970-11-03
•
Expires: 1988-09-27
Abstract
No abstract record available.
Inventors
- 👤 Leo Moscou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:23
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/186
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2882244A
Cited
US3130007A
Cited
US3140253A
Cited
US3375065A
Cited
US3369865A
Cited
US3402996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |