Patent US4052290A successfully refreshed from Google Patents.
US4052290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asphalt compositions
Assignee: Mobil Oil AS
•
Filing: 1976-07-26
•
Granted: 1977-10-04
•
Expires: 1996-07-26
Abstract
Abstract Improved asphalt compositions are provided which are produced by forming a homogeneous blend of marginal asphalt stock with coal-derived asphaltenes, and air-blowing the homogeneous blend to yield an asphalt composition having a viscosity-penetration index higher than about 2.5 × 10 5 .
Inventors
- 👤 Donald R. Cushman
- 👤 Charles A. Pagen
- 👤 John W. Schick
- 👤 Tsoung-Yuan Yan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:41
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/02; C10C3/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
A process for upgrading asphalt which consists essentially of admixing and forming a homogeneous blend of coal-derived asphaltenes with a marginal asphalt which has a potential air-blown viscosity-penetration index lower than about 2.5 × 10 5 , and air blowing the homogeneous blend to yield an asphalt composition having a viscosity-penetration index higher than about 2.5 × 10 5 .
Claim 2
Dependent Claim
60 words
A process for upgrading asphalt which consists essentially of admixing and forming a homogeneous blend of coal-derived asphaltenes with a marginal asphalt which has a potential air-blown viscosity-penetration index lower than about 2.5 × 10 5 , and air blowing the homogeneous blend to yield an asphalt composition having a viscosity-penetration index higher than about 2.5 × 10 5 .
Claim 3
Dependent Claim
26 words
A process in accordance with claim 1 wherein the homogeneous blending of asphalt and asphaltenes is conducted at a temperature between about 200° and 800° F.
Claim 4
Dependent Claim
29 words
A process in accordance with claim 1 wherein the coal-derived asphaltenes are employed in a quantity between about 1-50 weight percent, based on the total weight of the composition.
Claim 5
Dependent Claim
16 words
A process in accordance with claim 1 wherein the asphaltenes are derived from solvent refined coal.
Claim 6
Dependent Claim
15 words
A process in accordance with claim 1 wherein the asphaltenes are derived from hydrogenated coal.
Claim 7
Dependent Claim
15 words
A process in accordance with claim 1 wherein the asphaltenes are derived from coal tar.
Claim 8
Dependent Claim
13 words
An improved asphalt composition produced in accordance with the process 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) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |