Patent US3345394A successfully refreshed from Google Patents.
US3345394A
Expired / Lapsed
US
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Method of cleaving a thiocarbamic acid ester
Assignee: Bayer AG
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Filing: 1963-05-06
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Granted: 1967-10-03
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Expires: 1983-05-06
Abstract
No abstract record available.
Inventors
- 👤 Pelster Heinrich
- 👤 Muhlbauer Ernst
- 👤 Delfs Detlef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:34
CPC Classifications
C; C07; C07C; C07C263/00; C07C319/00; C07C319/14; C07C319/20; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/38; C07D307/52; C07D317/00; C07D317/08; C07D317/10; C07D317/14; C07D317/18; C07D317/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A METHOD OF CLEAVING A THIOCARBAMIC ACID ESTER HAVING THE FORMULA R1(-NH-CO-S-R2)N WHEREIN R1 IS AN ALKYL, ARYL, ARALKYL, ALKYLENE, A FURFURYL OR CYCLOALKYL RADICAL R2 IS A LOWER ALKYL RADICAL AND N IS 1 TO 3 AND IS EQUAL TO THE NUBMER OF FREE VALENCES OF RF, AND SEPARATING THE RESULTING ORGANIC ISOCYANATE AND MERCAPTAN WHICH COMPRISES HEATING SAID THIOCARBAMIC ACID ESTER TO A TEMPERATURE OF ABOUT 100 TO 600*C. UNDER REDUCED PRESSURE TO CLEAVE SAID THIOCARBAMIC ACID ESTER INTO THE CORRESPONDING ISOCYANATE HAVING THE FORMULA R1(-N=C=)N AND MERCAPTAN HAVING THE FORMULA R2(-S-H)N, IMMEDIATLEY COOLING SAID IOCYANATE AND MERCAPTAN TO A TEMPERATURE BELOW ABOUT 80*C. TO FORM A LIQUID ISOCYANATE AND A GASEOUS MERCAPTAN AND WITHDRAWING THE GASEOUS MERCAPTAN FROM THE LIUQID ISOCYANATE.
Claim 2
Independent Claim
124 words
A METHOD OF CLEAVING A THIOCARBAMIC ACID ESTER HAVING THE FORMULA R1(-NH-CO-S-R2)N WHEREIN R1 IS AN ALKYL, ARYL, ARALKYL, ALKYLENE, A FURFURYL OR CYCLOALKYL RADICAL R2 IS A LOWER ALKYL RADICAL AND N IS 1 TO 3 AND IS EQUAL TO THE NUBMER OF FREE VALENCES OF RF, AND SEPARATING THE RESULTING ORGANIC ISOCYANATE AND MERCAPTAN WHICH COMPRISES HEATING SAID THIOCARBAMIC ACID ESTER TO A TEMPERATURE OF ABOUT 100 TO 600*C. UNDER REDUCED PRESSURE TO CLEAVE SAID THIOCARBAMIC ACID ESTER INTO THE CORRESPONDING ISOCYANATE HAVING THE FORMULA R1(-N=C=)N AND MERCAPTAN HAVING THE FORMULA R2(-S-H)N, IMMEDIATLEY COOLING SAID IOCYANATE AND MERCAPTAN TO A TEMPERATURE BELOW ABOUT 80*C. TO FORM A LIQUID ISOCYANATE AND A GASEOUS MERCAPTAN AND WITHDRAWING THE GASEOUS MERCAPTAN FROM THE LIUQID ISOCYANATE.
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) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |