UST900015I4
Expired / Lapsed
US
⏱️ 0.0 years remaining
defensive publication
Assignee: —
•
Filing: 1970-10-01
•
Granted: 1972-07-25
•
Expires: 1990-10-01
Abstract
Abstract PROCESS FOR PREPARING TRIMETHYLHYDROQUINONE BY CONTACTING 2,6,6-TRIMETHYLCYCLOHEX-2-ENE-1,4-DIONE WITH AN ACYLATING AGENT IN THE PRESENCE OF AN ACID CATALYST. TRIMETHYLHYDROQUINONE DIESTER IS FORMED FIRST, WHICH MAY BE HYDROLYZED BY TREATMENT WITH AQUEOUS ACID OR BASE. WHEN THE HYDROLYSIS MIXUTRE COOLS, TRIMETHYLHYDROQUINONE MAY BE SEPARATED THEREFROM.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:04
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/01; C07C37/055; C07C37/0555
Claims Analysis
Total Claims: 0
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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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |