US3403109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica-alumina catalyst support
Assignee: Wyeth Holdings LLC
•
Filing: 1965-10-15
•
Granted: 1968-09-24
•
Expires: 1985-10-15
Abstract
No abstract record available.
Inventors
- 👤 Colgan Joseph Dennis
- 👤 Sanborn William Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:41
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/06; B01J21/08; B01J21/12; Y; Y10; Y10S; Y10S502/00; Y10S502/50; Y10S502/504
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2478519A
Cited
US2601235A
Cited
US2763533A
Cited
US2933456A
Cited
US2839475A
Cited
US3004292A
Cited
US3243262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |