US2821544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of alkylisocyanate esters of 2-alkenoic acids
Assignee: Bayer AG
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Filing: 1955-04-25
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Granted: 1958-01-28
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Expires: 1975-04-25
Abstract
No abstract record available.
Inventors
- 👤 Holtschmidt Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:16
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
IN THE MANUFACTURE OF AN ESTER ISOCYANATE BY A PROCESS WHICH COMPRISES ESTERIFYING A MEMBER SELECTED FROM THE GROUP CONSISTING OF 2-ALKENOIC ACIDS HAVING FROM 3 TO 4 CARBON ATOMS, THEIR ANHYDRIDES AND CHLORIDES, AND THEREAFTER PHOSGENATING THE RESULTING ESTER, THE STEP WHICH COMPRISES REACTING THE SAID MEMBER WITH A CHLOROHYDRATE OF AN AMINO ALCOHOL HAVING THE FORMULA
Claim 2
Dependent Claim
58 words
IN THE MANUFACTURE OF AN ESTER ISOCYANATE BY A PROCESS WHICH COMPRISES ESTERIFYING A MEMBER SELECTED FROM THE GROUP CONSISTING OF 2-ALKENOIC ACIDS HAVING FROM 3 TO 4 CARBON ATOMS, THEIR ANHYDRIDES AND CHLORIDES, AND THEREAFTER PHOSGENATING THE RESULTING ESTER, THE STEP WHICH COMPRISES REACTING THE SAID MEMBER WITH A CHLOROHYDRATE OF AN AMINO ALCOHOL HAVING THE FORMULA
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) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |