US3755402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Esters of cyanic acid and method of preparation
Assignee: Bayer AG
•
Filing: 1970-06-16
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Granted: 1973-08-28
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Expires: 1990-06-16
Abstract
Abstract CYANIC ACID ESTERS HAVING THE FORMULA R(O-C$N)X IN WHICH R IS AN ALKYL OR CYCLOALKYL RADICAL CONTAINING AN ELECTRON-ATTRACTING SUBSTITUENT, AN ARYL RADICAL, A SUBSTITUTED ARYL RADICAL FREE FROM THE DIMULTANEIOUS PRESENCE OF STERICALLY HINDERED SUBSTITUENTS IN BOTH ORTHO POSITIONS TO THE CORRESPONDING -0-C$N GROUP OR A HETEROCYCLIC RADICAL, AND X IS A WHOLE NUMBER FROM 1 TO 6. THE ESTERS CAN BE HYDROLYZED TO THE CORRESPONDING CARBONATES WHICH ARE KNOWN COMPOUNDS.
Inventors
- 👤 E Grigat
- 👤 R Putter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:06
CPC Classifications
C; C07; C07C; C07C261/00; C07C261/02; C07C271/00; C07C271/06; C07C271/40; C07C271/42; C07C271/44; C07C303/00; C07C303/02; C07C303/22; C07C331/00; C07C331/02; C07C331/08; C07D; C07D215/00; C07D215/02; C07D215/16; C07D215/20; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/18; C07D231/20; C07D231/22; C07C2601/00; C07C2601/12; C07C2601/14; C07C2601/16
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |