US2680128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing organic dhsocyanates
Assignee: Monsanto Chemicals Ltd
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Filing: 1952-01-02
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Granted: 1954-06-01
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Expires: 1972-01-02
Abstract
No abstract record available.
Inventors
- 👤 Robert J Slocombe
- 👤 James H Saunders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:31
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN THE METHOD OF PRODUCING ORGANIC DIISOCYANATES BOILING FROM ABOUT 70* C. TO ABOUT 175* C. AT ABOUT 10 TO ABOUT 20 MM. OF HG BY REACTING PHOSGENE WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE CORRESPONDING PRIMARY ORGANIC DIAMINES AND THEIR HYDROHALIDE SALTS IN THE PRESENCE OF A LOW BOILING INERT ORGANIC SOLVENT AND THEREBY FORMING A CRUDE SOLUTION OF THE CORRESPONDING DIISOCYANATE, THE IMPROVEMENT WHICH COMPRISES ADDING A PLASTICIZER TO SAID SOLUTION AND THEN FRACTIONALLY DISTILLING THE RESULTING PRODUCT TO RECOVER ITS DIISOCYANATE CONTENT SAID PLASTICIZER BEING SELECTED FROM THE GROUP CONSISTING OF A POLYCYCLIC AROMATIC HYDROCARBON, A HYDROGENATED POLYCYCLIC AROMATIC HYDROCARBON AND A CHLORINATED AROMATIC HYDROCARBON WHICH BOILS AT A TEMPERATURE OF FROM ABOUT 270* C. TO ABOUT 400* C.
Claim 2
Dependent Claim
125 words
IN THE METHOD OF PRODUCING ORGANIC DIISOCYANATES BOILING FROM ABOUT 70* C. TO ABOUT 175* C. AT ABOUT 10 TO ABOUT 20 MM. OF HG BY REACTING PHOSGENE WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE CORRESPONDING PRIMARY ORGANIC DIAMINES AND THEIR HYDROHALIDE SALTS IN THE PRESENCE OF A LOW BOILING INERT ORGANIC SOLVENT AND THEREBY FORMING A CRUDE SOLUTION OF THE CORRESPONDING DIISOCYANATE, THE IMPROVEMENT WHICH COMPRISES ADDING A PLASTICIZER TO SAID SOLUTION AND THEN FRACTIONALLY DISTILLING THE RESULTING PRODUCT TO RECOVER ITS DIISOCYANATE CONTENT SAID PLASTICIZER BEING SELECTED FROM THE GROUP CONSISTING OF A POLYCYCLIC AROMATIC HYDROCARBON, A HYDROGENATED POLYCYCLIC AROMATIC HYDROCARBON AND A CHLORINATED AROMATIC HYDROCARBON WHICH BOILS AT A TEMPERATURE OF FROM ABOUT 270* C. TO ABOUT 400* C.
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) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |