Patent US2945875A successfully refreshed from Google Patents.
US2945875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chlorination of aromatic polysocyanates
Assignee: FMC Corp
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Filing: 1957-04-01
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Granted: 1960-07-19
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Expires: 1977-04-01
Abstract
No abstract record available.
Inventors
- 👤 Tazuma James Junkichi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:29
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
THE METHOD OF PREPARING MONO- AND DI-NUCLEAR HALOGENATED AROMATIC DIISOCYANATES WHICH COMPRISES REACTING A HALOGEN SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND BROMINE WITH A MOLTEN MASS OF AN UNSUBSTITUTED AROMATIC DIISOCYANATE SELECTED FROM THE GROUP CONSISTING OF PHENYL, BIPHENYL AND METHYLENE BISPHENYL DIISOCYANATES AT A TEMPERATURE ABOVE THE MELTING POINT AND BELOW THE BOILING POINT OF THE DIISOCYANATE, AND IN THE ABSENCE OF SOLVENT, THEREBY SUBSTITUTING HALOGEN ON THE AROMATIC NUCLEOUS OF THE DIISOCYANATE TO PRODUCE SAID NUCLEAR HALOGENATED DIISOCYANATE.
Claim 2
Independent Claim
82 words
THE METHOD OF PREPARING MONO- AND DI-NUCLEAR HALOGENATED AROMATIC DIISOCYANATES WHICH COMPRISES REACTING A HALOGEN SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND BROMINE WITH A MOLTEN MASS OF AN UNSUBSTITUTED AROMATIC DIISOCYANATE SELECTED FROM THE GROUP CONSISTING OF PHENYL, BIPHENYL AND METHYLENE BISPHENYL DIISOCYANATES AT A TEMPERATURE ABOVE THE MELTING POINT AND BELOW THE BOILING POINT OF THE DIISOCYANATE, AND IN THE ABSENCE OF SOLVENT, THEREBY SUBSTITUTING HALOGEN ON THE AROMATIC NUCLEOUS OF THE DIISOCYANATE TO PRODUCE SAID NUCLEAR HALOGENATED DIISOCYANATE.
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) | 1963-07-19 | 1964-01-18 | 1964-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-19 | 1968-01-18 | 1968-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-19 | 1972-01-18 | 1972-07-19 | $7700.00 | Window Closed / Lapsed |