US2991308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of exo-norborneol
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1957-12-30
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Granted: 1961-07-04
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Expires: 1977-12-30
Abstract
No abstract record available.
Inventors
- 👤 Charles A Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:23
CPC Classifications
C; C07; C07C; C07C35/00; C07C35/22; C07C35/23; C07C35/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PROCESS FOR PREPARING CYCLOPENTANE-1,3-DICARBOXYLIC ACIDS WHICH COMPRISES ADMIXING A BICYCLO(2,2,1)HEPTANOL HAVING NO MORE THAN A SINGLE C1-C4 ALKYL SIDE CHAIN WITH 4 TO 10 MOLE EEQUIVALENT OF 40-60% NITRIC ACID AND 0.1 TO 0.5 PART BY WEIGHT OF VANADIC ACID PER PART OF NITRIC ACID AT A TEMPERATURE ABOVE 50*C. BUT BELOW THE BOILING TEMPERATURE OF SIAD ACID, MAINTAINING THE RESULTANT ADMIXTURE WITHIN SAID TEMPERATURE RANGE FOR FROM 1 TO 4 HOURS, DISTILLING THE ADMIXTURE UNDER REDUCED PRESSURE TO REMOVE SUBSTANTIALLY ALL EXCESS NITRIC ACID, AND RECOVERING THE SOLID DICARBOXYLIC ACID FROM THE RESIDUE.
Claim 2
Dependent Claim
95 words
A PROCESS FOR PREPARING CYCLOPENTANE-1,3-DICARBOXYLIC ACIDS WHICH COMPRISES ADMIXING A BICYCLO(2,2,1)HEPTANOL HAVING NO MORE THAN A SINGLE C1-C4 ALKYL SIDE CHAIN WITH 4 TO 10 MOLE EEQUIVALENT OF 40-60% NITRIC ACID AND 0.1 TO 0.5 PART BY WEIGHT OF VANADIC ACID PER PART OF NITRIC ACID AT A TEMPERATURE ABOVE 50*C. BUT BELOW THE BOILING TEMPERATURE OF SIAD ACID, MAINTAINING THE RESULTANT ADMIXTURE WITHIN SAID TEMPERATURE RANGE FOR FROM 1 TO 4 HOURS, DISTILLING THE ADMIXTURE UNDER REDUCED PRESSURE TO REMOVE SUBSTANTIALLY ALL EXCESS NITRIC ACID, AND RECOVERING THE SOLID DICARBOXYLIC ACID FROM THE RESIDUE.
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) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |