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US3501418A
Expired / Lapsed
US
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Process for preparing cracking catalysts
Assignee: WR Grace and Co
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Filing: 1967-07-14
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Granted: 1970-03-17
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Expires: 1987-07-14
Abstract
No abstract record available.
Inventors
- 👤 John S Magee Jr
- 👤 George J Surland
- 👤 Warren S Briggs
- 👤 Frank G Ciapetta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:39
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/08; B01J29/082; B01J21/00; B01J21/16; B01J21/20; B01J2229/00; B01J2229/30; B01J2229/42
Claims Analysis
Total Claims: 0
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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) | 1973-03-16 | 1973-09-15 | 1974-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-16 | 1977-09-15 | 1978-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-16 | 1981-09-15 | 1982-03-17 | $7700.00 | Window Closed / Lapsed |