Patent US4285497A successfully refreshed from Google Patents.
Patent US5247431A successfully refreshed from Google Patents.
Patent US2994726A successfully refreshed from Google Patents.
US2994726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocarbon radicals
Assignee: Shell USA Inc
•
Filing: 1959-09-17
•
Granted: 1961-08-01
•
Expires: 1979-09-17
Abstract
No abstract record available.
Inventors
- 👤 Russell L Hodgson
- 👤 John H Raley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:30
CPC Classifications
C; C07; C07C; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/16; C07C2/00; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
20 words
A PROCESS FOR PREPARING DIISOPROPYL WHICH COMPRISES PYROLYZING 9,10-DIHYDRO-9,10-DIISOPROPYLANTHRACENE AT A TEMPERATURE OF ABOUT 450*C. AND RECOVERING DIISOPROPYL AND ANTHRACENE.
Claim 2
Dependent Claim
20 words
A PROCESS FOR PREPARING DIISOPROPYL WHICH COMPRISES PYROLYZING 9,10-DIHYDRO-9,10-DIISOPROPYLANTHRACENE AT A TEMPERATURE OF ABOUT 450*C. AND RECOVERING DIISOPROPYL AND ANTHRACENE.
Claim 3
Dependent Claim
21 words
A PROCESS FOR PREPARING DIALLYL WHICH COMPRISES PYROLYZING 9,10-DIHYDRO-9,10-DIALLYL ANTHRACENE AT A TEMPERATURE OF ABOUT 450*C. AND RECOVERING DIALLYL AND ANTHRACENE.
Claim 4
Dependent Claim
21 words
A PROCESS FOR PREPARING DIALLYL WHICH COMPRISES PYROLYZING 9,10-DIHYDRO-9,10-DIALLYL ANTHRACENE AT A TEMPERATURE OF ABOUT 450*C. AND RECOVERING DIALLYL AND ANTHRACENE.
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) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |