US2881200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing esters of di(organo) phosphinodithioic acids
Assignee: Lubrizol Corp
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Filing: 1954-01-26
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Granted: 1959-04-07
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Expires: 1974-01-26
Abstract
No abstract record available.
Inventors
- 👤 Willis G Craig
- 👤 Clark O Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:09
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/30; C07F9/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
THE PROCESS OF PREPARING DITHIO-ESTERS OF PHOSPHINODITHIOIC ACIDS WHICH COMPRISES PREPARING A MIXTURE CONSISTING ESSENTIALLY OF (A) A PHOSPHINODITHIOIC ACID HAVING THE FOLLOWING STRUCTURE:
Claim 2
Dependent Claim
24 words
THE PROCESS OF PREPARING DITHIO-ESTERS OF PHOSPHINODITHIOIC ACIDS WHICH COMPRISES PREPARING A MIXTURE CONSISTING ESSENTIALLY OF (A) A PHOSPHINODITHIOIC ACID HAVING THE FOLLOWING STRUCTURE:
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) | 1962-04-06 | 1962-10-06 | 1963-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-06 | 1966-10-06 | 1967-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-06 | 1970-10-06 | 1971-04-07 | $7700.00 | Window Closed / Lapsed |