US2688631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing dicyano stilbenes
Assignee: California Research LLC
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Filing: 1949-09-26
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Granted: 1954-09-07
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Expires: 1969-09-26
Abstract
No abstract record available.
Inventors
- 👤 Jr William G Toland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:10
CPC Classifications
C; C07; C07C; C07C63/00; C07C63/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A PROCESS OF PREPARING DICYANO STILBENES FROM CYANO NUCLEAR-SUBSTITUTED TOLUENES WHICH COMPRISES DEHYDROGENATING AND CONCURRENTLY DIMERIZING CYANO-SUBSTITUTED TOLUENES AT THE METHYL RADICAL BY HEATING SAID TOLUENES TO AN ELEVATED TEMPERATURE IN THE RANGE BETWEEN ABOUT 200* F. TO ABOUT 1200* F. IN THE PRESENCE OF SULFUR FOR A PERIOD OF TIME SUFFICIENT TO COMPLETE THE REACTION AS INDICATED BY H2S NO LONGER BEING EVOLVED AND SEPARATING THE DICYANO STILBENE PRODUCTS FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
74 words
A PROCESS OF PREPARING DICYANO STILBENES FROM CYANO NUCLEAR-SUBSTITUTED TOLUENES WHICH COMPRISES DEHYDROGENATING AND CONCURRENTLY DIMERIZING CYANO-SUBSTITUTED TOLUENES AT THE METHYL RADICAL BY HEATING SAID TOLUENES TO AN ELEVATED TEMPERATURE IN THE RANGE BETWEEN ABOUT 200* F. TO ABOUT 1200* F. IN THE PRESENCE OF SULFUR FOR A PERIOD OF TIME SUFFICIENT TO COMPLETE THE REACTION AS INDICATED BY H2S NO LONGER BEING EVOLVED AND SEPARATING THE DICYANO STILBENE PRODUCTS FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
US2610191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-06 | 1958-03-08 | 1958-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-06 | 1962-03-08 | 1962-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-06 | 1966-03-08 | 1966-09-07 | $7700.00 | Window Closed / Lapsed |