US3546138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Promoted antimony-iron oxidation catalyst
Assignee: Standard Oil Co
•
Filing: 1968-06-05
•
Granted: 1970-12-08
•
Expires: 1988-06-05
Abstract
No abstract record available.
Inventors
- 👤 James L Callahan
- 👤 Robert K Grasselli
- 👤 Warren R Knipple
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:09
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/24; C07C253/26; B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/89; B01J23/8933; B01J23/8973; C07C45/00; C07C45/27; C07C45/32; C07C45/33; C07C45/34; C07C45/35; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3259652A
Cited
US3142697A
Cited
US3197419A
Cited
US3244642A
Cited
US3200084A
Cited
US3200081A
Cited
US3198750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-07 | 1974-06-08 | 1974-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-07 | 1978-06-08 | 1978-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-07 | 1982-06-08 | 1982-12-08 | $7700.00 | Window Closed / Lapsed |