Patent US2903491A successfully refreshed from Google Patents.
US2903491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of cyclooctatetraene
Assignee: BASF SE
•
Filing: 1957-06-04
•
Granted: 1959-09-08
•
Expires: 1977-06-04
Abstract
No abstract record available.
Inventors
- 👤 Reppe Walter
- 👤 Reicheneder Franz
- 👤 Dury Karl
- 👤 Suter Hubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:30
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2/42; C07C2/48; C07C2531/00; C07C2531/02; C07C2531/16; C07C2531/22; C07C2601/00; C07C2601/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A PROCESS FOR THE PRODUCTION OF CYCLOOCTATETRAENE BY CYCLIZING POLYMERIZATION OF ACETYLENE, COMPRISING THE STEPS OF PRETREATING A SOLUTION OF ACTIVATING AMOUNTS OF ALUMINUM ISOPROPYLATE IN ANHYDROUS TETRAHYDROFURANE WITH ACETYLENE AT A PRESSURE OF 25 TO 27 ATMOSPHERES AND AT A TEMPERATURE OF ABOUT 110* TO 120*C., ADDING TO THIS ACTIVATED SOLUTION A SOLUTION OF NICKEL ACETYLACETONATE IN TETRAHYDROFURANE SERVING AS CATALYST, AND THEN TREATING THIS MIXTURE WITH ACETYLENE AT ABOUT 65* TO 75*C. AND AT A PRESSURE OF 25 TO 27 ATMOSPHERES.
Claim 2
Dependent Claim
83 words
A PROCESS FOR THE PRODUCTION OF CYCLOOCTATETRAENE BY CYCLIZING POLYMERIZATION OF ACETYLENE, COMPRISING THE STEPS OF PRETREATING A SOLUTION OF ACTIVATING AMOUNTS OF ALUMINUM ISOPROPYLATE IN ANHYDROUS TETRAHYDROFURANE WITH ACETYLENE AT A PRESSURE OF 25 TO 27 ATMOSPHERES AND AT A TEMPERATURE OF ABOUT 110* TO 120*C., ADDING TO THIS ACTIVATED SOLUTION A SOLUTION OF NICKEL ACETYLACETONATE IN TETRAHYDROFURANE SERVING AS CATALYST, AND THEN TREATING THIS MIXTURE WITH ACETYLENE AT ABOUT 65* TO 75*C. AND AT A PRESSURE OF 25 TO 27 ATMOSPHERES.
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) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |