US2673187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beryllia regeneration of ironpoisoned cracking catalysts
Assignee: Standard Oil Co
•
Filing: 1951-06-07
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Granted: 1954-03-23
•
Expires: 1971-06-07
Abstract
No abstract record available.
Inventors
- 👤 Harrison M Stine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:28
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/02; B01J23/04; B01J21/00; B01J21/20; B01J23/90; B01J23/92; Y; Y10; Y10S; Y10S502/00; Y10S502/50; Y10S502/501
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
A METHOD WHICH CONSISTS ESSENTIALLY OF APPLYING TO AN UNTREATED, AGED, IRON-POISONED SILICAALUMINA CRACKING CATALYST A FRACTION OF A PER CENT BY WEIGHT OF BERYLLIA.
Claim 2
Independent Claim
25 words
A METHOD WHICH CONSISTS ESSENTIALLY OF APPLYING TO AN UNTREATED, AGED, IRON-POISONED SILICAALUMINA CRACKING CATALYST A FRACTION OF A PER CENT BY WEIGHT OF BERYLLIA.
References Cited (Backward Citations)
US2480627A
Cited
US2580004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |