Patent EP0104018A2 successfully refreshed from Google Patents.
Patent US2837549A successfully refreshed from Google Patents.
US2837549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zinc dialkyl dithiophosphates
Assignee: Wyeth Holdings LLC
•
Filing: 1955-05-12
•
Granted: 1958-06-03
•
Expires: 1975-05-12
Abstract
No abstract record available.
Inventors
- 👤 Richard F Reeves
- 👤 Dominic J Cestoni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:30
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/16; C07F9/165
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A METHOD OF PREPARING AN IMPROVEMENT AGENT FOR LUBRICANTS COMPRISING THE STEPS OF REACTING PHOSPHORUS PENTASULFIDE WITH AN ALCOHOL HAVING THE FORMULA ROH WHEREIN R IS A HIGHER ALKYL RADICAL HAVING FROM 6 TO 18 CARBON ATOMS TO FORM A REACTION PRODUCT CONTAINING A DIALKYL DITHIOPHOSPHORIC ACID, TREAING THE REACTION PRODUCT WITH AN ALCOHOL HVING THE FORMULA R''OH WHEREIN R'' IS A LOWER ALKYL RADICAL HAVING UP TO 4 CARBON ATOMS AT A TEMPERATURE OF FROM ABOUT 170 TO ABOUT 195*F. FOR FROM ABOUT 1/2 TO ABOUT 21/2 HOURS, NEUTRALIZING WITH A BASIC ZINC COMPOUND TO FORM A REACTION PRODUCT CONTAINING A ZINC DIALKYL DITHIOPHOSPHATE AND AGING SAID REACTION PRODUCT AT A TEMPERATURE OF FROM ABOUT 140 TO ABOUT 195*F. FOR FROM ABOUT 1/2 TO ABOUT 6 HOURS.
Claim 2
Independent Claim
128 words
A METHOD OF PREPARING AN IMPROVEMENT AGENT FOR LUBRICANTS COMPRISING THE STEPS OF REACTING PHOSPHORUS PENTASULFIDE WITH AN ALCOHOL HAVING THE FORMULA ROH WHEREIN R IS A HIGHER ALKYL RADICAL HAVING FROM 6 TO 18 CARBON ATOMS TO FORM A REACTION PRODUCT CONTAINING A DIALKYL DITHIOPHOSPHORIC ACID, TREAING THE REACTION PRODUCT WITH AN ALCOHOL HVING THE FORMULA R''OH WHEREIN R'' IS A LOWER ALKYL RADICAL HAVING UP TO 4 CARBON ATOMS AT A TEMPERATURE OF FROM ABOUT 170 TO ABOUT 195*F. FOR FROM ABOUT 1/2 TO ABOUT 21/2 HOURS, NEUTRALIZING WITH A BASIC ZINC COMPOUND TO FORM A REACTION PRODUCT CONTAINING A ZINC DIALKYL DITHIOPHOSPHATE AND AGING SAID REACTION PRODUCT AT A TEMPERATURE OF FROM ABOUT 140 TO ABOUT 195*F. FOR FROM ABOUT 1/2 TO ABOUT 6 HOURS.
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) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |