Patent US3247269A successfully refreshed from Google Patents.
US3247269A
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Methods of producing cyclic polyolefins
Assignee: Columbian Carbon Co
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Filing: 1962-01-23
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Granted: 1966-04-19
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Expires: 1982-01-23
Abstract
No abstract record available.
Inventors
- 👤 Charles D Storrs
- 👤 Reginald F Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:34
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2/42; C07C2/44; C07C2/46; C07C2/465; C07C2531/00; C07C2531/16; C07C2531/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
A METHOD OF PREPARING CYCLIC UNSATURATED OLIGOMERS, WHICH COMPRISES SUBJECTING AN ACYCLIC CONJUGATED DIOLEFIN TO THE INFLUENCE OF A CATALYST OF THE FORMULA:
Claim 2
Independent Claim
23 words
A METHOD OF PREPARING CYCLIC UNSATURATED OLIGOMERS, WHICH COMPRISES SUBJECTING AN ACYCLIC CONJUGATED DIOLEFIN TO THE INFLUENCE OF A CATALYST OF THE FORMULA:
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) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |