US3446754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst activation
Assignee: Millennium Petrochemicals Inc
•
Filing: 1965-12-03
•
Granted: 1969-05-27
•
Expires: 1985-12-03
Abstract
No abstract record available.
Inventors
- 👤 Ragnar S Solvik
- 👤 William Kirch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:01
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26; B01J37/00; B01J8/00; B01J8/18; B01J8/1836
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3172882A
Cited
GB896305A
Cited
US3239498A
Cited
US3225023A
Cited
US3322691A
Cited
US3281405A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |