US3445521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Promoted antimony-iron oxidation catalyst
Assignee: Standard Oil Co
•
Filing: 1966-11-17
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Granted: 1969-05-20
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Expires: 1986-11-17
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
2026-11-02 06:48
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; C07C5/00; C07C5/42; C07C5/48; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2627527A
Cited
US3197419A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |