Patent US5167610A successfully refreshed from Google Patents.
Patent US3202727A successfully refreshed from Google Patents.
US3202727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of butadiene by oxidation to remove acetylene
Assignee: Distillers Co Yeast Ltd
•
Filing: 1962-12-20
•
Granted: 1965-08-24
•
Expires: 1982-12-20
Abstract
No abstract record available.
Inventors
- 👤 Dancer Stuart Neil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:08
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/14808; C07C7/14816
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A PROCESS WHICH COMPRISES PASSING A GAS STREAM CONTAINING BUTADIENE, ACETYLENE, AND SUFFICIENT OXYGEN TO OXIDIZE THE ACETYLENE AT A TEMPERATURE BETWEEN 120* AND 275*C. OVER A SOLID COPPER-CONTAINING CATALYST COMPRISING COPPER OXIDE AND SELECTIVELY OXIDIZING THE ACETYLENE TO REMOVE IT FROM THE GAS STREAM.
Claim 2
Dependent Claim
45 words
A PROCESS WHICH COMPRISES PASSING A GAS STREAM CONTAINING BUTADIENE, ACETYLENE, AND SUFFICIENT OXYGEN TO OXIDIZE THE ACETYLENE AT A TEMPERATURE BETWEEN 120* AND 275*C. OVER A SOLID COPPER-CONTAINING CATALYST COMPRISING COPPER OXIDE AND SELECTIVELY OXIDIZING THE ACETYLENE TO REMOVE IT FROM THE GAS STREAM.
References Cited (Backward Citations)
US3068304A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |