Patent US4873660A successfully refreshed from Google Patents.
Patent US2852445A successfully refreshed from Google Patents.
US2852445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Addition of microcrystalline wax to lubricating oils to prevent wax flocculation
Assignee: California Research LLC
•
Filing: 1955-06-29
•
Granted: 1958-09-16
•
Expires: 1975-06-29
Abstract
No abstract record available.
Inventors
- 👤 Francis M Howard
- 👤 Charles J Halamka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:07
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
40 words
A METHOD OF PREVENTING FLOCCULATION IN REFINED PETROLEUM LUBRICATING OILS OF NAPHTHENIC ORIGIN AND HAVING A VISCOSITY ABOVE ABOUT 1200 SSU AT 100*F., WHICH COMPRISES DISSOLVING IN THE OIL FROM ABOUT 0.02 TO 1% BY WEIGHT OF A MICROCRYSTALLINE WAX.
Claim 2
Independent Claim
40 words
A METHOD OF PREVENTING FLOCCULATION IN REFINED PETROLEUM LUBRICATING OILS OF NAPHTHENIC ORIGIN AND HAVING A VISCOSITY ABOVE ABOUT 1200 SSU AT 100*F., WHICH COMPRISES DISSOLVING IN THE OIL FROM ABOUT 0.02 TO 1% BY WEIGHT OF A MICROCRYSTALLINE WAX.
Claim 3
Dependent Claim
11 words
A LUBRICATING OIL COMPOSITION PRODUCED NY THE METHOD OF CLAIM 1.
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) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |