Patent US2531328A successfully refreshed from Google Patents.
US2531328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing indenes
Assignee: California Research LLC
•
Filing: 1948-07-01
•
Granted: 1950-11-21
•
Expires: 1968-07-01
Abstract
No abstract record available.
Inventors
- 👤 William E Elwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:26
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/32; C07C5/373
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A PROCESS OF PRODUCING INDENES AND METHYL HOMOLOGS THEREOF, BY CATALYTIC DEHYDROGENATION WHICH PROCESS COMPRISES SUBJECTING A MEMBER OF THE GROUP CONSISTING OR ORTHO ETHYL TOLUENE, 2,3DIMETHYL 1-ETHYL BENZENE, 2,4-DIMETHYL 1-ETHYL BENZENE, 2,5-DIMETHYL 1-ETHYL BENZENE, AND 2,6DIMETHYL 1-ETHYL BENZENE TO CATALYTIC DEHYDROGENATION SO AS TO PRODUCE A CORRESPONDING SUBSTITUTED VINYL PRODUCT AND INDENE COMPOUND AND SEPARATING THE INDENE COMPOUND FROM THE REACTION PRODUCTS.
Claim 2
Dependent Claim
63 words
A PROCESS OF PRODUCING INDENES AND METHYL HOMOLOGS THEREOF, BY CATALYTIC DEHYDROGENATION WHICH PROCESS COMPRISES SUBJECTING A MEMBER OF THE GROUP CONSISTING OR ORTHO ETHYL TOLUENE, 2,3DIMETHYL 1-ETHYL BENZENE, 2,4-DIMETHYL 1-ETHYL BENZENE, 2,5-DIMETHYL 1-ETHYL BENZENE, AND 2,6DIMETHYL 1-ETHYL BENZENE TO CATALYTIC DEHYDROGENATION SO AS TO PRODUCE A CORRESPONDING SUBSTITUTED VINYL PRODUCT AND INDENE COMPOUND AND SEPARATING THE INDENE COMPOUND FROM THE REACTION PRODUCTS.
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) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |