Patent US3553244A successfully refreshed from Google Patents.
US3553244A
Expired / Lapsed
US
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Esters of cyanic acid
Assignee: Bayer AG
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Filing: 1968-02-12
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Granted: 1971-01-05
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Expires: 1988-02-12
Abstract
Abstract IN WHICH R IS AN ALKYL OR CYCLOALKYL RADICAL CONTAINING AN ELECTRON-ATTRACTING SUBSTITUENT, AN ARYL RADICAL, A SUBSTITUTED ARYL RADICAL FREE FROM THE SIMULTANEOUS PRESENCE OF STERICALLY HINDERED SUBSTITUENTS IN BOTH ORTHO POSITIONS TO THE CORRESPONDING -O-C$N GROUP OR HETEROCYCLIC RADICAL, AND X IS A WHOLE NUMBER FROM 1 TO 6. R$O-C$N)X CYANIC ACID ESTERS HAVING THE FORMULA
Inventors
- 👤 Ernst Grigat
- 👤 Rolf Putter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:22
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
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |