US2721181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricant
Assignee: Kendall Refining Co
•
Filing: 1952-10-09
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Granted: 1955-10-18
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Expires: 1972-10-09
Abstract
No abstract record available.
Inventors
- 👤 Franklin I L Lawrence
- 👤 Robert K Smith
- 👤 Michael J Pohorilla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:59
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/30; C10L1/301; C10L1/303; C07; C07F; C07F5/00; C07F5/02; C07F5/04; C10M; C10M139/00; C10M2207/00; C10M2207/28; C10M2207/282; C10M2207/34; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/105; C10M2219/00; C10M2219/02; C10M2219/024; C10M2219/04; C10M2219/044; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/047; C10M2227/00; C10M2227/06; C10M2227/061; C10N; C10N2010/00; C10N2010/06; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A LUBRICANT CONSISTING ESSENTIALLY OF OIL OF LUBRICATING VISCOSITY CONTAINING AN ORGANO-BORON COMPOSITION PRODUCED BY PASSING A FREE-OXYGEN CONTAINING GAS THROUGH A NORMALLY LIQUID PARAFFINIC PETROLEUM FRACTION HAVING A BOILING POINT IN THE RANGE OF ABOUT 350* F. TO ABOUT 800* F., MAINTAINED AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 305* F. TO ABOUT 385* F.; THERE BEING AVAILABLE IN SAID FRACTION FROM ABOUT 1 TO 3 CHEMICAL EQUIVALENTS OF AN ACID, SELECTED FROM THE GROUP CONSISTING OF ORTHO-BORIC ACID AND META-BORIC ACID PER MOL OF PARAFFINIC HYDROCARBON; SAID GAS BEING PASSED THROUGH SAID FRACTION AT A RATE REQUISITE TO PROVIDE NOT MORE THAN ABOUT 0.6 CUBIC FEET OF OXYGEN PER HOUR PER GALLON OF SAID FRACTION; TO PRODUCE A CRUDE REACTION PRODUCT CONTAINING AT LEAST ABOUT 0.2% BY WEIGHT OF CHEMICALLY COMBINED BORON, SAID COMPOSITION BEING PRESENT IN AN AMOUNT SUFFICIENT TO INHIBIT OXIDATION OF SAID OIL FRACTION.
Claim 2
Dependent Claim
150 words
A LUBRICANT CONSISTING ESSENTIALLY OF OIL OF LUBRICATING VISCOSITY CONTAINING AN ORGANO-BORON COMPOSITION PRODUCED BY PASSING A FREE-OXYGEN CONTAINING GAS THROUGH A NORMALLY LIQUID PARAFFINIC PETROLEUM FRACTION HAVING A BOILING POINT IN THE RANGE OF ABOUT 350* F. TO ABOUT 800* F., MAINTAINED AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 305* F. TO ABOUT 385* F.; THERE BEING AVAILABLE IN SAID FRACTION FROM ABOUT 1 TO 3 CHEMICAL EQUIVALENTS OF AN ACID, SELECTED FROM THE GROUP CONSISTING OF ORTHO-BORIC ACID AND META-BORIC ACID PER MOL OF PARAFFINIC HYDROCARBON; SAID GAS BEING PASSED THROUGH SAID FRACTION AT A RATE REQUISITE TO PROVIDE NOT MORE THAN ABOUT 0.6 CUBIC FEET OF OXYGEN PER HOUR PER GALLON OF SAID FRACTION; TO PRODUCE A CRUDE REACTION PRODUCT CONTAINING AT LEAST ABOUT 0.2% BY WEIGHT OF CHEMICALLY COMBINED BORON, SAID COMPOSITION BEING PRESENT IN AN AMOUNT SUFFICIENT TO INHIBIT OXIDATION OF SAID OIL FRACTION.
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) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |