US3755138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lube oils by solvent dewaxing and hydrodewaxing with a zsm-5 catalyst
Assignee: Mobil Oil AS
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Filing: 1971-12-10
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Granted: 1973-08-28
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Expires: 1991-12-10
Abstract
Abstract A two-step or combination process for preparing low pour point lube oils is set forth. The process involves subjecting a lube stock to a mild solvent dewaxing step, so as to obtain high quality waxes and a lube stock having an intermediate pour point; recovering the waxes and subjecting said intermediate pour point lube stock to a hydrowaxing step over a crystalline aluminosilicate of the ZSM-5 type to obtain a product having a pour point of 0* F and lower.
Inventors
- 👤 Yuen Chen Nai
- 👤 W Garwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:05
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; C01B33/2876; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J29/405; C10; C10G; C10G2400/00; C10G2400/10; Y; Y10; Y10S; Y10S208/00; Y10S208/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
21 words
The process of claim 1 wherein the ZSM-5 type zeolite has X-ray diffraction patterns corresponding to that set forth in Table
Claim 2
Dependent Claim
12 words
The process of claim 1 wherein the ZSM-5 type zeolite is ZSM-8.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein the ZSM-5 type zeolite has been base exchanged with hydrogen ions, ammonium ions, and mixtures thereof.
Claim 4
Dependent Claim
18 words
The process of claim 4 wherein the product obtained has a pour point no higher than -20* F.
References Cited (Backward Citations)
US3539498A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |