US3458558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of isocyanates by reducing the hydrolyzable chlorine content
Assignee: Honeywell International Inc
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Filing: 1963-10-25
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Granted: 1969-07-29
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Expires: 1983-10-25
Abstract
No abstract record available.
Inventors
- 👤 Chao Shing Cheng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:36
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/18; C07C263/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A PROCESS FOR TREATING AN ORGANIC ISOCYANATE CONTAING HYDROLYZABLE CHLORINE AS AN IMPURITY WHICH COMPRISES HEATING A MIXTURE OF AN ORGANIC ISOCYANATE CONTAINHYDROLYZABLE CHLORINE AND AN AGENT SELECTED FROM THE GROUP CONSISTING OF COPPER, SILVER, NICKEL, IRON AND ZINC, AT A TEMPERATURE ABOVE 100*C. BUT BELOW THAT AT OCCURS, AND RECOVERING ORGANIC ISOCYANATE HAVING A SUBSTATIALLY REDUCED CONTENT OF HYDROLYZABLE CHLORINE FROM THE TREATED MIXTURE.
Claim 2
Dependent Claim
65 words
A PROCESS FOR TREATING AN ORGANIC ISOCYANATE CONTAING HYDROLYZABLE CHLORINE AS AN IMPURITY WHICH COMPRISES HEATING A MIXTURE OF AN ORGANIC ISOCYANATE CONTAINHYDROLYZABLE CHLORINE AND AN AGENT SELECTED FROM THE GROUP CONSISTING OF COPPER, SILVER, NICKEL, IRON AND ZINC, AT A TEMPERATURE ABOVE 100*C. BUT BELOW THAT AT OCCURS, AND RECOVERING ORGANIC ISOCYANATE HAVING A SUBSTATIALLY REDUCED CONTENT OF HYDROLYZABLE CHLORINE FROM THE TREATED MIXTURE.
References Cited (Backward Citations)
US3155699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-28 | 1973-01-27 | 1973-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-28 | 1977-01-27 | 1977-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-28 | 1981-01-27 | 1981-07-29 | $7700.00 | Window Closed / Lapsed |