US3433581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation catalysts
Assignee: Ethyl Corp
•
Filing: 1965-10-21
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Granted: 1969-03-18
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Expires: 1985-10-21
Abstract
No abstract record available.
Inventors
- 👤 Ruth E Stephens
- 👤 Daniel A Hirschler Jr
- 👤 Frances W Lamb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:46
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/024; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/92; B01D53/94; B01D53/944; B01J23/00; B01J23/70; B01J23/72; B01J23/76; B01J23/83; B01J35/00; B01J35/50; B01J35/51; B01J37/03; B01J37/08; B01J37/082; B01J37/086
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-17 | 1972-09-16 | 1973-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-17 | 1976-09-16 | 1977-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-17 | 1980-09-16 | 1981-03-18 | $7700.00 | Window Closed / Lapsed |