US4820857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
α-bromodiethylcarbonate
Assignee: Astra Lakemedel AB
•
Filing: 1988-04-13
•
Granted: 1989-04-11
•
Expires: 2008-04-13
Abstract
Abstract The novel compound α-bromodiethylcarbonate, novel methods for the preparation thereof, its use in the preparation of 1-ethoxycarbonyloxyethyl esters of penicillins and cephalosporins, and improvements in the method for preparing such esters.
Inventors
- 👤 Derek R. Palmer
- 👤 Robert G. Tyson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:04
CPC Classifications
C; C07; C07D; C07D499/00; C07C; C07C68/00; C07C68/02; C07C69/00; C07C69/96; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/55
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
The compound of the formula ##STR9##
Claim 2
Dependent Claim
6 words
The compound of the formula ##STR9##
References Cited (Backward Citations)
DE1795702A1
Cited
DE1795701A1
Cited
US3873521A
Cited
AT309683B
Cited
DE2161420A1
Cited
FR2141968A1
Cited
GB1433131A
Cited
GB1425571A
Cited
GB1426869A
Cited
GB1426717A
Cited
GB1427139A
Cited
GB1443738A
Cited
DE2423490A1
Cited
SE7505741L
Cited
US4072677A
Cited
BE866093A
Cited
FR2387988A1
Cited
DE3008257A1
Cited
JPS56128736A
Cited
FR2482587A1
Cited
EP0054512A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |