US3487028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified charcoal-cyanide catalyst for acrylonitrile production
Assignee: Phillips Petroleum Co
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Filing: 1967-04-18
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Granted: 1969-12-30
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Expires: 1987-04-18
Abstract
No abstract record available.
Inventors
- 👤 Clifford E Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:18
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/24; B01J27/26; C; C07; C07C; C07C253/00; C07C253/08; C07C253/10; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
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) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |