Patent US2957929A successfully refreshed from Google Patents.
US2957929A
Expired / Lapsed
US
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Production of alpha, omega-diisopropenylalkanes
Assignee: Shell USA Inc
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Filing: 1958-06-23
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Granted: 1960-10-25
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Expires: 1978-06-23
Abstract
No abstract record available.
Inventors
- 👤 Mare Harold E De La
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:25
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/20; C07C1/24; C07C2521/00; C07C2521/02; C07C2521/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
THE PROCESS FOR THE PRODUCTION OF REACTION MIXTURES CONSISTING PREDOMINANTLY OF ALPHA,OMEGA-DIISOPROPENYLALKANES WHICH COMPRISES CONTACTING A DI-TERT, DIHYDRIC ALCOHOL OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
23 words
THE PROCESS FOR THE PRODUCTION OF REACTION MIXTURES CONSISTING PREDOMINANTLY OF ALPHA,OMEGA-DIISOPROPENYLALKANES WHICH COMPRISES CONTACTING A DI-TERT, DIHYDRIC ALCOHOL OF THE GENERAL FORMULA:
References Cited (Backward Citations)
US1682919A
Cited
US1944153A
Cited
US2204157A
Cited
US2389205A
Cited
US2419030A
Cited
US2502431A
Cited
US2715649A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |