US2810681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical process
Assignee: EIDP Inc
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Filing: 1956-08-17
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Granted: 1957-10-22
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Expires: 1976-08-17
Abstract
No abstract record available.
Inventors
- 👤 Martin L Nadler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:24
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/18; C07C263/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
IN THE PROCESS FOR RECOVERING TOLUENE DIISOCYANATE FROM CRUDE REACTION MIXTURE CONTAINING TARRY MATERIALS IN WHICH THE CRUDE IS PASSED INTO A NON-VOLATILE NAPHTHENIC HYDROCARBON OIL WHICH IS HELD AT TEMPERATURES OF FROM 200* TO 315*C, AT PRESSURE OF FROM 1 TO 80 MM. MERCURY, THE IMPROVEMENT WHICH COMPRISES HAVING INCORPORATED IN THE NAPHTHENIC HYDROCARBON OIL FROM 0.05% TO 3.0%, BASED ON THE WEIGHT OF THE OIL, OF AN OIL-SOLUBLE BASIC AMINO NITROGEN CONTAINING ADDITION TYPE COPOLYER CONTAINING IN COMBIND FORM AS ITS ESSENTIAL MONOMERIC COMPONENTS COPOLYMERIZABLE ETHYLENICALLY UNSATURATED COMPOUNDS EACH CONTAINING ONLY ONE POLYMERIZABLE ETHYLENIC INKAGE, AT LEAST ONE OF WHICH COMPONENTS IS AMINE-FREE AND CONTAINS FROM 8 TO 18 CARBON ATOMS IN AN ALIPHATIC HYDROCARBON CHAIN WHICH IN THE COPOLMER IS NOT PART OF THE MAIN CHAIN, AND ONE OF THE COMPONENTS AS IT EXISTS IN THE COPOLYMER CONTAINING A BASIC AMINO NITROGEN IN THE SIDE CHAIN, SAID COPOLYMER CONTAINING 0.1% TO 3.0% BY WEIGHT OF BASIC AMINO NITROGEN.
Claim 2
Dependent Claim
161 words
IN THE PROCESS FOR RECOVERING TOLUENE DIISOCYANATE FROM CRUDE REACTION MIXTURE CONTAINING TARRY MATERIALS IN WHICH THE CRUDE IS PASSED INTO A NON-VOLATILE NAPHTHENIC HYDROCARBON OIL WHICH IS HELD AT TEMPERATURES OF FROM 200* TO 315*C, AT PRESSURE OF FROM 1 TO 80 MM. MERCURY, THE IMPROVEMENT WHICH COMPRISES HAVING INCORPORATED IN THE NAPHTHENIC HYDROCARBON OIL FROM 0.05% TO 3.0%, BASED ON THE WEIGHT OF THE OIL, OF AN OIL-SOLUBLE BASIC AMINO NITROGEN CONTAINING ADDITION TYPE COPOLYER CONTAINING IN COMBIND FORM AS ITS ESSENTIAL MONOMERIC COMPONENTS COPOLYMERIZABLE ETHYLENICALLY UNSATURATED COMPOUNDS EACH CONTAINING ONLY ONE POLYMERIZABLE ETHYLENIC INKAGE, AT LEAST ONE OF WHICH COMPONENTS IS AMINE-FREE AND CONTAINS FROM 8 TO 18 CARBON ATOMS IN AN ALIPHATIC HYDROCARBON CHAIN WHICH IN THE COPOLMER IS NOT PART OF THE MAIN CHAIN, AND ONE OF THE COMPONENTS AS IT EXISTS IN THE COPOLYMER CONTAINING A BASIC AMINO NITROGEN IN THE SIDE CHAIN, SAID COPOLYMER CONTAINING 0.1% TO 3.0% BY WEIGHT OF BASIC AMINO NITROGEN.
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) | 1960-10-21 | 1961-04-22 | 1961-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-21 | 1965-04-22 | 1965-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-21 | 1969-04-22 | 1969-10-22 | $7700.00 | Window Closed / Lapsed |