Patent US3607722A successfully refreshed from Google Patents.
US3607722A
Expired / Lapsed
US
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Asphalt manufacture
Assignee: Shell USA Inc
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Filing: 1969-11-28
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Granted: 1971-09-21
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Expires: 1989-11-28
Abstract
Abstract Asphalt products having improved rheological properties are prepared from asphaltic residues by means of catalytic hydrogenation under moderate conditions.
Inventors
- 👤 Gordon A Mclaren
- 👤 John W Gibson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:30
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/02; C10C; C10C3/00; C10C3/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
18 words
The process of claim 1 wherein the asphaltic residue is composed predominantly of fractions boiling above 650* F.
Claim 2
Dependent Claim
14 words
The process of claim 1 wherein the catalyst comprises nickel molybdenum supported on alumina.
Claim 3
Dependent Claim
129 words
A process for producing asphalt products from asphaltic pitch which comprises contacting hard asphaltic pitch having a penetration of less than 5 decimillimeters at 77* F. with hydrogen in the presence of a nickel molybdenum supported on alumina catalyst at a temperature in the range from about 600* F. to about 850* F., a pressure of from about 1,000 to about 5,000 pounds per square inch gauge and a weight hourly space velocity of about 0.2 to about 2.0 and recovering an asphalt product having a penetration at 77* F. of about 30 to about 500 decimillimeters and a viscosity at 275* F. between about 50 and about 500 centistokes, wherein less than about 15 percent w/o of the pitch feed is converted to products boiling below 600* F.
Claim 4
Dependent Claim
39 words
The process of claim 4 wherein the catalytic hydrogenation is performed at a temperature in the range of about 675* F. to about 775* F. at a pressure of about 1,500 to about 3,500 pounds per square inch gauge.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |