Patent US3211631A successfully refreshed from Google Patents.
US3211631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noilvttitsig gnv noijovhlxh
Assignee: —
•
Filing: —
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Granted: 1965-10-12
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Expires: 1982-10-12
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:27
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/06; C07C263/00; C07C263/18; C07C263/20; C07C265/00; C07C265/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
90 words
A PROCESS FOR RECOVERY OF ORGANIC ISOCYANATE FROM A CRUDE REACTION MIXTURE CONTAINING SAID ORGANIC ISOCYANATE, AN INERT DILUENT, AND IMPURITIES WHICH COMPRISES HEATING SAID CRUDE MIXTURE TO DISTILL SAID INERT DILUENT THEREFROM, LEAVING A RESIDUE CONTAINING SAID ORGANIC ISOCYANATE AND SAID IMPURITIES, ADMIXING WITH SAID RESIDUE AN INERT ORGANIC SOLVENT FOR SAID ORGANIC ISOCYANATE TO YIELD A LIQUID PHASE OF SAID ORGANIC SOLVENT CONTAINING SAID ORGANIC ISOCYANATE, SEPARATING SAID LIQUID PHASE FROM SAID IMPURITIES, AND DISTILLING SAID LIQUID PHASE TO SEPARATE SAID ORGANIC ISOCYANATE FROM SAID INERT ORGANIC SOLVENT.
References Cited (Backward Citations)
US2453472A
Cited
US2614971A
Cited
US2625561A
Cited
US2889257A
Cited
US2884359A
Cited
US3040002A
Cited
GB887874A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |