US2728787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing organic diisocyanates
Assignee: Rohm and Haas Co
•
Filing: 1953-03-03
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Granted: 1955-12-27
•
Expires: 1973-03-03
Abstract
No abstract record available.
Inventors
- 👤 Melvin D Hurwitz
- 👤 Robert W Auten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:45
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
51 words
A PROCESS FOR PREPARING ORGANIC DIISOCYANATES HAVING THE FORMULA OCN-R-NCO IN WHICH R IS A DIVALENT, SATURATED, HYDROCARBON RADICAL FROM THE GROUP CONSISTING OF ALIPHATIC AND ALICYCLIC RADICALS CONTAINING AT LEAST FOUR CARBON ATOMS, WHICH PROCESS COMPRISES DEHYDROHALOGENATING, IN THE PRESENCE OF A TERTIARY AMINE, A COMPOUND HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
51 words
A PROCESS FOR PREPARING ORGANIC DIISOCYANATES HAVING THE FORMULA OCN-R-NCO IN WHICH R IS A DIVALENT, SATURATED, HYDROCARBON RADICAL FROM THE GROUP CONSISTING OF ALIPHATIC AND ALICYCLIC RADICALS CONTAINING AT LEAST FOUR CARBON ATOMS, WHICH PROCESS COMPRISES DEHYDROHALOGENATING, IN THE PRESENCE OF A TERTIARY AMINE, A COMPOUND HAVING THE GENERAL FORMULA
Claim 3
Dependent Claim
10 words
AS A NEW COMPOSITION OF MATTER, 1,8-DIISOCYANATO-PMENTHANE OF THE FORMULA
Claim 4
Dependent Claim
10 words
AS A NEW COMPOSITION OF MATTER, 1,8-DIISOCYANATO-PMENTHANE OF THE FORMULA
References Cited (Backward Citations)
US2640846A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |