US3853953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkyl (n-phenylsulfonyloxy) carbamates
Assignee: F Hoffmann La Roche AG
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Filing: 1973-06-25
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Granted: 1974-12-10
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Expires: 1993-06-25
Abstract
Abstract Substituted (N-p-arylsulfonyloxy)carbamates are disclosed. These compounds are used as starting materials in the preparation of 1,4-benzodiazepin-2-ones.
Inventors
- 👤 J Hellerbach
- 👤 A Walser
- 👤 H Bretschneider
- 👤 W Rudolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:35
CPC Classifications
C; C07; C07D; C07D243/00; C07D243/06; C07D243/10; C07D243/14; C07D243/16; C07D243/18; C07D243/24; C07C; C07C271/00; C07C271/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
24 words
The compound of claim 1 wherein R3 is hydrogen, R4 is ethyl and R5 is p-tolyl, i.e., a compound of the formula ethyl (N-methyl-N-p-toluenesulfonyloxy)carbamate.
Claim 4
Dependent Claim
24 words
The compound of claim 1 wherein R3 is phenyl, R4 is ethyl and R5 is p-tolyl, i.e., a compound of the formula ethyl (N-benzyl-N-p-toluenesulfonyloxy)carbamate.
Claim 5
Dependent Claim
24 words
The compound of claim 1 wherein R3 is methyl; R4 is ethyl and R5 is p-tolyl, i.e., a compound of the formula ethyl (N-ethyl-N-p-toluenesulfonyloxy)carbamate.
References Cited (Backward Citations)
US3663594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |