US3631198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 1 5-diisocyanato-2-methylpentane
Assignee: Millennium Petrochemicals Inc
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Filing: 1966-09-07
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Granted: 1971-12-28
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Expires: 1986-09-07
Abstract
Abstract A PROCESS IS PROVIDED FOR THE PREPARATION OF 1,5-DIISOCYANATO- 2 - METHYLPENTANE FROM 1,5-DIAMINO-2-METHYLPENTANE, ITS HYDROCHLORIDE, CARBAMATE OR CARBAMYL CHLORIDE SALT THEREOF, BY REACTION WITH PHOSGENE IN SOLUTION IN A LOWER ALKYL ESTER OF PHTHALIC ACID AS THE SOLVENT FOR THE REACTION.
Inventors
- 👤 David Horvitz
- 👤 Robert J Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:07
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/73; C07; C07C; C07C263/00; C07C263/10
Claims Analysis
Total Claims: 0
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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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |