US2809975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of endovinylene cyclohexane tetracarbonic acid and anhydride
Assignee: Lonza AG
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Filing: 1953-06-30
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Granted: 1957-10-15
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Expires: 1973-06-30
Abstract
No abstract record available.
Inventors
- 👤 Bezard Andre Von
- 👤 Perret Adrien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:24
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/54; C07C51/567; C07C67/00; C07C67/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A PROCESS FOR THE PREPARING OF ENDOVINYLENE CYCLOHEXANE TETRACARBONIC ACIDS AND ANHYDRIDES THEREOF COMPRISING MIXING ONE MOLE OF AN ALPHA, BETA UNSATURATED CARBONYL COMPOUND, AN ACYLATING AGENT AND TWO MOLE OF MALEIC ANHYDRIDE, CONDENSING IN SAID MIXTURE SAID ALPHA, BETA UNSATURATED CARBONYL COMPOUND WITH SAID ACYLATING AGENT TO A DIENOL ESTER, AND REACTING SAID DIENOL ESTER IN SAID MIXTURE IMMEDIATELY WITH SAID MALEIC ANHYDRIDE.
Claim 2
Dependent Claim
64 words
A PROCESS FOR THE PREPARING OF ENDOVINYLENE CYCLOHEXANE TETRACARBONIC ACIDS AND ANHYDRIDES THEREOF COMPRISING MIXING ONE MOLE OF AN ALPHA, BETA UNSATURATED CARBONYL COMPOUND, AN ACYLATING AGENT AND TWO MOLE OF MALEIC ANHYDRIDE, CONDENSING IN SAID MIXTURE SAID ALPHA, BETA UNSATURATED CARBONYL COMPOUND WITH SAID ACYLATING AGENT TO A DIENOL ESTER, AND REACTING SAID DIENOL ESTER IN SAID MIXTURE IMMEDIATELY WITH SAID MALEIC ANHYDRIDE.
References Cited (Backward Citations)
US1993034A
Cited
US2121294A
Cited
US2262002A
Cited
DE739438C
Cited
US2537873A
Cited
US2632011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |