Patent US3669918A successfully refreshed from Google Patents.
US3669918A
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US
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Bituminous compositions containing high molecular weight ethylene/propylene copolymer
Assignee: Dow Chemical Co
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Filing: 1969-06-18
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Granted: 1972-06-13
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Expires: 1989-06-18
Abstract
Abstract Bituminous compositions having improved impact strength at both high and low temperatures comprise asphalt and an ethylene/propylene copolymer having a molecular weight from about 50,000 to about 100,000.
Inventors
- 👤 Charles F Raley Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:19
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/16; C08L95/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
34 words
An asphalt composition according to claim 1 wherein the copolymer contains from about 10 to about 70 weight percent of polymerized ethylene and from about 90 to about 30 weight percent of polymerized propylene.
Claim 2
Dependent Claim
21 words
An asphalt composition according to claim 1 wherein the copolymer has a molecular weight ranging from about 50,000 to about 80,000.
Claim 3
Dependent Claim
35 words
An asphalt composition according to claim 1 wherein the composition contains from about 99 to about 75 weight percent of the asphalt material and from about 1 to about 25 weight percent of the copolymer.
Claim 4
Dependent Claim
34 words
A bituminous composition according to claim 4 wherein the copolymer contains from about 40 to about 50 weight percent of polymerized ethylene and from about 60 to about 50 weight percent of polymerized propylene.
Claim 5
Dependent Claim
13 words
A bituminous composition according to claim 1 wherein the bituminous material is asphalt.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |