US3617475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing lubricating oils with good low temperature hazing properties
Assignee: Gulf Research and Development Co
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Filing: 1970-01-15
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Granted: 1971-11-02
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Expires: 1990-01-15
Abstract
Abstract A process for producing a finished lubricating oil with good low-temperature hazing properties from lubricating oil base stocks comprised substantially of components boiling above 800* F. and containing more than about 0.75 percent by weight sulfur by subjecting such base stock to hydrofinishing and then dewaxing the hydrofinished base stock.
Inventors
- 👤 William C Offutt
- 👤 Richard G Goldthwait
- 👤 James R Murphy
- 👤 Harry C Stauffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:29
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/02; C10G45/04; C10G45/06; C10G45/08; C10G2400/00; C10G2400/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
22 words
The process of claim 1 wherein the lubricating oil base stock has a 10 percent boiling point of at least 800* F.
Claim 2
Dependent Claim
36 words
The process of claim 1 wherein the lubricating oil base stock is a fraction having a range from about 90* to about 120* F. between its 10 percent boiling point and its 90 percent boiling point.
Claim 3
Dependent Claim
36 words
The process of claim 2 wherein the lubricating oil base stock is a fraction having a range from about 90* to about 120* F. between its 10 percent boiling point and its 90 percent boiling point.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein the lubricating oil base stock contains more than about 1.0 percent by weight sulfur.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein the lubricating oil base stock is obtained from a paraffinic-type crude oil.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein the lubricating oil base stock is obtained from a naphthenic type crude oil.
Claim 7
Dependent Claim
22 words
The process of claim 1 wherein the catalyst carrier has a cracking activity on the Kellogg scale of less than about 25.
References Cited (Backward Citations)
US2787582A
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US2960458A
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US2967147A
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US2984616A
Cited
US3012963A
Cited
US3285848A
Cited
US3293173A
Cited
US3403092A
Cited
US3340183A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |