Patent US3862989A successfully refreshed from Google Patents.
US3862989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbodiimide catalysts and processes
Assignee: 3M Co
•
Filing: 1973-06-08
•
Granted: 1975-01-28
•
Expires: 1993-06-08
Abstract
Abstract Phosphine oxides are prepared from terpenes and are found to be valuable as catalysts in the condensation of isocyanates to yield carbodiimides.
Inventors
- 👤 Robert L Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:27
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/53
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
28 words
A BICYCLE TERPENE ALKYL OR HYDROCARBYL ARYL PHOSPHINE OXIDE WHEREIN ALKYL IS OF 1 TO 10 CARBON ATOMS AND HYDROCARBYL ARYL IS OF 6 TO 10 CARBON ATOMS.
Claim 2
Dependent Claim
28 words
A BICYCLE TERPENE ALKYL OR HYDROCARBYL ARYL PHOSPHINE OXIDE WHEREIN ALKYL IS OF 1 TO 10 CARBON ATOMS AND HYDROCARBYL ARYL IS OF 6 TO 10 CARBON ATOMS.
Claim 3
Dependent Claim
4 words
Camphene phenyl phosphine oxide.
Claim 4
Dependent Claim
4 words
Camphene phenyl phosphine oxide.
Claim 5
Dependent Claim
4 words
Pinene phenyl phosphine oxide.
Claim 6
Dependent Claim
4 words
Pinene phenyl phosphine oxide.
Claim 7
Dependent Claim
43 words
A process for the production of alkyl or hydrocarbyl aryl phosphine oxide comprising condensing a bicyclic C10H16 terpene with 1 to 10 carbon atom alkyl phosphine dihalide or 6 to 10 carbon atom hydrocarbyl aryl phosphine dihalide in the presence of Friedel-Crafts catalyst.
Claim 8
Dependent Claim
43 words
A process for the production of alkyl or hydrocarbyl aryl phosphine oxide comprising condensing a bicyclic C10H16 terpene with 1 to 10 carbon atom alkyl phosphine dihalide or 6 to 10 carbon atom hydrocarbyl aryl phosphine dihalide in the presence of Friedel-Crafts catalyst.
Claim 9
Dependent Claim
11 words
The process according to claim 4 wherein the terpene is camphene.
Claim 10
Dependent Claim
13 words
The process according to claim 4 wherein the phosphine dihalide is phenyl dichlorophosphine.
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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |