US3781224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of activating a catalyst
Assignee: Societa Italiana Resine SpA SIR
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Filing: 1971-11-05
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Granted: 1973-12-25
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Expires: 1991-11-05
Abstract
Abstract SILVER-BASED CATALYSTS FOR THE OXIDATION OF ETHYLENE ARE ACTIVATED BY HEATING IN NITROGEN THEN IN NITROGEN WITH AN OXYGEN CONTENT PROGRESSIVELY RAISED TO 20%.
Inventors
- 👤 N Ferlazzo
- 👤 G Antonelli
- 👤 G Aglietti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:22
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/48; B01J23/54; B01J23/66; C; C07; C07D; C07D301/00; C07D301/02; C07D301/03; C07D301/04; C07D301/08; C07D301/10; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y10; Y10S; Y10S502/00; Y10S502/506; Y10S502/512
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |