US3752880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing isocyanic acid and stabilizing same
Assignee: Stauffer Chemical Co
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Filing: 1969-03-17
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Granted: 1973-08-14
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Expires: 1989-03-17
Abstract
Abstract A METHOD FOR THE PREPARATION OF ISOCYANIC ACID FROM CARBAMOYL CHLORIDE WITH A HYDROGEN CHLORIDE ABSTRACTOR, THE BASICITY OF WHICH IS SUFFICIENT TO ABSTRACT HYDROGEN CHLORIDE FROM THE CARBAMOYL CHLORIDE BUT INSUFFICIENT TO CAUSE POLYMERIZATION OF THE FORMED ISOCYANIC ACID. PREFERRED HYDROGEN CHLORIDE ABSTRACTORS ARE THE WEAK LEWIS BASES SUCH AS THE ETHERS, THIOETHERS AND N''N-DISUBSTITUTED AMIDES.
Inventors
- 👤 W Stamm
- 👤 C Greco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:37
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/20
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |