US3284470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Octahydrophenanthrenetetracarboxylic acids, anhydrides, esters and the process of their preparation
Assignee: Dow Chemical Co
•
Filing: 1965-06-21
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Granted: 1966-11-08
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Expires: 1985-06-21
Abstract
No abstract record available.
Inventors
- 👤 Hugh A Farber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:08
CPC Classifications
C; C07; C07C; C07C61/00; C07C61/16; C07C61/28; C07C61/29; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/26
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
47 words
A COMPOUND HAVING ONES OF THE FORMULAS (I) 1,6-DI(R''-CO-),2,5-DI(R-CO-),4,8-DI(R"-)-1,2,3,4B,5, 6,7,10A-OCTAHYDROPHENANTHRENE AND (II) 1,8-DI(R"-),3,5-DI(R-CO-),4,6-DI(R''-CO-)-2,3,4,4A, 4B,5,6,7-OCTAHYDROPHENANTHRENE WHEREIN R AND R'' WHEN TAKEN SEPARATELY ARE HYDROXY OR ALKOXY OF 1-8 CARBON ATOMS AND WHEN TAKEN TOGETHER R AND R'' CONSTITUTE AN OXYGEN ATOM, AND WHEREIN R" IS HYDROGEN OR METHYL.
Claim 2
Dependent Claim
47 words
A COMPOUND HAVING ONES OF THE FORMULAS (I) 1,6-DI(R''-CO-),2,5-DI(R-CO-),4,8-DI(R"-)-1,2,3,4B,5, 6,7,10A-OCTAHYDROPHENANTHRENE AND (II) 1,8-DI(R"-),3,5-DI(R-CO-),4,6-DI(R''-CO-)-2,3,4,4A, 4B,5,6,7-OCTAHYDROPHENANTHRENE WHEREIN R AND R'' WHEN TAKEN SEPARATELY ARE HYDROXY OR ALKOXY OF 1-8 CARBON ATOMS AND WHEN TAKEN TOGETHER R AND R'' CONSTITUTE AN OXYGEN ATOM, AND WHEREIN R" IS HYDROGEN OR METHYL.
Claim 3
Dependent Claim
49 words
A PROCESS FOR MAKING THE COMPOUND OF CLAIM 1 WHICH COMPRISES REACTING BY CONTACTING AT LEAST ABOUT TWO MOLES OF A MALEIC ACID COMPOUND WITH A MOLD OF AT LEAST ONE OF THE COMPOUNDS M-DIVINYLBENZENE, P-DIVINYLBENZENE, M-DIISOPROPENYLBENZENE AND P-DIISOPROPENYL BENZENE IN LIQUID PHASE AT A TEMPERATURE OF 100-250* C.
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) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |