Patent US3755139A successfully refreshed from Google Patents.
US3755139A
Expired / Lapsed
US
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Asphalt manufacture
Assignee: Shell USA Inc
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Filing: 1971-05-19
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Granted: 1973-08-28
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Expires: 1991-05-19
Abstract
Abstract An asphalt flux having improved rheological properties is prepared from a straight run asphalt residue by means of catalytic hydrogenation under moderate conditions.
Inventors
- 👤 Claren G Mc
- 👤 J Gibson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:21
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/02; C10G; C10G45/00; C10G45/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
36 words
The process of claim 1 wherein the catalytic hydrogenation is performed at a temperature in the range of from 675*F to about 775*C and a pressure of 1,500 to about 3,500 pounds per square inch gauge.
Claim 2
Dependent Claim
16 words
fractionating the hydrotreated liquid product obtained in step 1 to remove materials boiling below 840*F, and
Claim 3
Dependent Claim
24 words
recovering an asphalt flux having a penetration at 77*F at least 40 decimillimeters higher than the corresponding boiling fraction in the straight-run residue feed.
Claim 4
Dependent Claim
13 words
The process of claim 2 wherein the catalyst comprises nickel-molybdenum supported on alumina.
Claim 5
Dependent Claim
38 words
The process of claim 1 wherein the recovered asphalt flux is air blown to produce a coating grade asphalt having a softening point of 215* to 222*F and a penetration at 77*F of between 15 and 25 decimillimeters.
Claim 6
Dependent Claim
23 words
The process of claim 1 wherein less than 15 percent of the straight-run residue asphalt feed is converted to products boiling below 600*F.
Claim 7
Dependent Claim
21 words
The process of claim 2 wherein the recovered asphalt flux has a penetration at 77*F of about 250 to 600 decimillimeters.
Claim 8
Dependent Claim
40 words
The process of claim 1 wherein recovered asphalt flux is air blown to produce a coating grade asphalt which is subsequently blended with a portion of the recovered asphalt flux or an unhydrogenated flux to produce a paving grade asphalt.
References Cited (Backward Citations)
US3258419A
Cited
US3607722A
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 |