Patent US2870080A successfully refreshed from Google Patents.
US2870080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asphalt plastisols and process for their preparation
Assignee: Shell Development Co
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Filing: 1953-11-09
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Granted: 1959-01-20
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Expires: 1973-11-09
Abstract
No abstract record available.
Inventors
- 👤 John C Illman
- 👤 Harry J Sommer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:17
CPC Classifications
C; C08; C08L; C08L95/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A PROCESS OF FORMING A BITUMINOUS PLASTISOL WHICH COMPRISES WASHING PULVERULENT BITUMINOUS MATERIAL HAVING AN AVERAGE PARTICLE SIZE BETWEEN ABOUT 0.5 MICRON AND ABOUT 200 MICRONS WITH NORMAL HEPTANE FOR A PERIOD AND AT A TEMPERATURE SUFFICIENT TO SUPERFICIALLY REMOVE MALTENES FROM THE SURFACE THEREOF AND SUBSQUENTLY SUSPENDING THE WASHED PRODUCT IN A PETROLEUM FRACTION IN THE LUBRICATING OIL RANGE, SAID OIL HAVING AN AROMATIC HYDROCARBON CONTENT FROM ABOUT 15% TO ABOUT 60% AND HAVING A VISCOSITY BETWEEN ABOUT 100 SUS AT 100* F. AND ABOUT 300 SUS AT 210*F., THE COMPOSITION SO PREPARED COMPRISING 40-60% BY WEIGHT OF SUSPENDED ASPHALT PARTICLES AND 60-40% BY WEIGHT OF THE SUSPENDING OIL.
Claim 2
Dependent Claim
110 words
A PROCESS OF FORMING A BITUMINOUS PLASTISOL WHICH COMPRISES WASHING PULVERULENT BITUMINOUS MATERIAL HAVING AN AVERAGE PARTICLE SIZE BETWEEN ABOUT 0.5 MICRON AND ABOUT 200 MICRONS WITH NORMAL HEPTANE FOR A PERIOD AND AT A TEMPERATURE SUFFICIENT TO SUPERFICIALLY REMOVE MALTENES FROM THE SURFACE THEREOF AND SUBSQUENTLY SUSPENDING THE WASHED PRODUCT IN A PETROLEUM FRACTION IN THE LUBRICATING OIL RANGE, SAID OIL HAVING AN AROMATIC HYDROCARBON CONTENT FROM ABOUT 15% TO ABOUT 60% AND HAVING A VISCOSITY BETWEEN ABOUT 100 SUS AT 100* F. AND ABOUT 300 SUS AT 210*F., THE COMPOSITION SO PREPARED COMPRISING 40-60% BY WEIGHT OF SUSPENDED ASPHALT PARTICLES AND 60-40% BY WEIGHT OF THE SUSPENDING OIL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |