US3926976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3,4-Dihydro-1,2,3-oxathiazine-4-ones and a process for their preparation
Assignee: Hoechst AG
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Filing: 1973-06-07
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Granted: 1975-12-16
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Expires: 1993-06-07
Abstract
Abstract 3,4-Dihydro-1,2,3-oxathiazinones, a class of chemical compounds having a ring system, are obtained by converting the enolether of a Beta -ketocarboxylic acid amide-N-sulfone to the enol and treating the enol with an aqueous base. The compounds and their salts are artificial sweetening agents. All of the compounds are organic intermediates having a plurality of reactive groups.
Inventors
- 👤 Karl Clauss
- 👤 Harald Jensen
- 👤 Erich Luck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:37
CPC Classifications
C; C07; C07D; C07D291/00; C07D291/08; A; A23; A23L; A23L27/00; A23L27/30; C07D291/02; C07D291/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
9 words
The method of making a compound of the formula
Claim 2
Independent Claim
9 words
The method of making a compound of the formula
Claim 3
Dependent Claim
43 words
The method as in claim 1 wherein R1 and R2, taken together with the carbon atoms to which they are attached, form an isocyclic ring having at least one substituent thereon selected from the group consisting of lower alkyl, lower alkoxy, and halogen.
Claim 4
Dependent Claim
25 words
The method as in claim 1 wherein R1 and R2, taken together with the carbon atoms to which they are attached, form a benzene ring.
Claim 5
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 6
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 7
Dependent Claim
18 words
A compound as in claim 4 wherein R1 is hydrogen or alkyl having 1 to 4 carbon atoms.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |