US3607865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of xanthates
Assignee: FMC Corp
•
Filing: 1968-05-28
•
Granted: 1971-09-21
•
Expires: 1988-05-28
Abstract
Abstract A method of forming alcohol xanthates utilizing a transxanthation reaction between an alcohol xanthate and an alcohol, is disclosed herein.
Inventors
- 👤 John Dyer
- 👤 Lyle H Phifer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:49
CPC Classifications
C; C07; C07C; C07C329/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
31 words
The method of claim 1 wherein the alcohol moiety of said derivative of an alcohol xanthic acid is derived from a monohydric aliphatic alcohol having from 1 to 18 carbon atoms.
Claim 2
Dependent Claim
21 words
The method of claim 1 wherein said free alcohol is a monohydric aliphatic alcohol having from 1 to 18 carbon atoms.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the alcohol moiety of said derivative of an alcohol xanthic acid is derived from a polysaccharide.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein said free alcohol is a polysaccharide.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein the pH ranges from about 2 to about 8.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein the temperature at which the transxanthation reaction is carried out ranges from about 0 to about 40* C.
Claim 7
Dependent Claim
12 words
The method of claim 1 wherein a transxanthated derivative product is recovered.
Claim 8
Dependent Claim
24 words
The method of claim 1 wherein the alcohol or incompletely regenerated alcohol from said derivative of alcohol xanthate is recovered as a shaped article.
Claim 9
Dependent Claim
15 words
The method of claim 9 wherein the alcohol is cellulose or an incompletely regenerated cellulose.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |