US2910438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of an extreme pressure additive and gear oil containing same
Assignee: Pure Oil Co
•
Filing: 1955-12-16
•
Granted: 1959-10-27
•
Expires: 1975-12-16
Abstract
No abstract record available.
Inventors
- 👤 Paul R Chapman
- 👤 Allan A Manteuffel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:19
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
THE PROCESS OF PREPARING AN EXTREME PRESSURE ADDDITIVE WHICH COMPRISES SULFURIZING FATTY OIL WITH SULFUR AT A TEMPERATURE OF 315 TO 360* F. TO A SULFUR CONCENTRATION OF ABOUT 5% TO 10% BY WEIGHT OF FATTY OIL FOR A PERIOD OF 2.5 TO 6 HOURS UNTIL IT PRODUCES A TAN COLOR UPON IMMERSING IN THE SULFURIZED OIL AT A TEMPERATURE OF 300* F. A COPPER STRIP FOR 1 MINUTE, STOPPING THE REACTION AT THIS STAGE AND THEREAFTER PHOSPHORIZING SAID SULFURIZED FATTY OIL AT A TEMPERATURE OF ABOUT 220 TO 235* F. TO A CONCENTRATION OF BOUND PHOSPHROUS IN THE FATTY OIL OF AT LEAST ABOUT 0.4%* BY WEIGHT OF THE SULFURIZED-PHOSPHOR IZED FATTY OIL UNTIL THE PRODUCT GIVES A TAN COLORED COPPER STRIP UPON IMMERSION IN THE PRODUCT FOR 1 MINUTE AT 300* F.
Claim 2
Dependent Claim
134 words
THE PROCESS OF PREPARING AN EXTREME PRESSURE ADDDITIVE WHICH COMPRISES SULFURIZING FATTY OIL WITH SULFUR AT A TEMPERATURE OF 315 TO 360* F. TO A SULFUR CONCENTRATION OF ABOUT 5% TO 10% BY WEIGHT OF FATTY OIL FOR A PERIOD OF 2.5 TO 6 HOURS UNTIL IT PRODUCES A TAN COLOR UPON IMMERSING IN THE SULFURIZED OIL AT A TEMPERATURE OF 300* F. A COPPER STRIP FOR 1 MINUTE, STOPPING THE REACTION AT THIS STAGE AND THEREAFTER PHOSPHORIZING SAID SULFURIZED FATTY OIL AT A TEMPERATURE OF ABOUT 220 TO 235* F. TO A CONCENTRATION OF BOUND PHOSPHROUS IN THE FATTY OIL OF AT LEAST ABOUT 0.4%* BY WEIGHT OF THE SULFURIZED-PHOSPHOR IZED FATTY OIL UNTIL THE PRODUCT GIVES A TAN COLORED COPPER STRIP UPON IMMERSION IN THE PRODUCT FOR 1 MINUTE AT 300* F.
References Cited (Backward Citations)
US2420280A
Cited
US2211306A
Cited
US2361522A
Cited
US2407954A
Cited
US2382121A
Cited
US2483600A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-26 | 1963-04-27 | 1963-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-26 | 1967-04-27 | 1967-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-26 | 1971-04-27 | 1971-10-27 | $7700.00 | Window Closed / Lapsed |