Patent US3683028A successfully refreshed from Google Patents.
US3683028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of trishydroxymethylphosphine oxide
Assignee: Individual
•
Filing: 1970-05-08
•
Granted: 1972-08-08
•
Expires: 1990-05-08
Abstract
Abstract Production of trishydroxymethylphosphine oxide from trishydroxymethylphosphine in the presence of water. The oxide is produced by reacting 1 mol of the phosphine with at least 1 mol water in contact with between 0.1 and 10 weight percent of a formaldehyde catalyst, based on the phosphine, at temperatures of between 60* and 200* C.
Inventors
- 👤 Hans Haas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:29
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/53; C07F9/5304
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
19 words
The process as claimed in claim 1, wherein between 1 and 20 mols water is used per mol phosphine.
Claim 2
Dependent Claim
23 words
The procesS as claimed in claim 1, wherein the formaldehyde catalyst is used in a proportion of between 1 and 5 weight percent.
Claim 3
Dependent Claim
21 words
The process as claimed in claim 1, wherein the reaction is carried out at temperatures of between 100* and 150* C.
Claim 4
Dependent Claim
17 words
The process as claimed in claim 4, wherein the reaction is carried out in a pressure-resistant vessel.
Claim 5
Dependent Claim
19 words
The process as claimed in claim 1, wherein the formaldehyde is used in the form of an aqueous solution.
Claim 6
Dependent Claim
17 words
The process as claimed in claim 1, wherein the formaldehyde is used in the form of paraformaldehyde.
References Cited (Backward Citations)
US3100799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |