US3629164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed blend of propane-precipitated asphalt ethylene-acrylate/methacrylate copolymer and polyol crosslinked in-situ
Assignee: Gulf Research and Development Co
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Filing: 1969-05-23
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Granted: 1971-12-21
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Expires: 1989-05-23
Abstract
Abstract A TOUGH, COHESIVE, NON-TACKY BLEND RESULTS WHEN PROPANE-PRECIPITATED ASPHALT IS MIXED WITH A COPOLYMER OF ETHYLENE WITH A LOWER ALKYL ACRYLATEOR METHACRYLATE, SUCH AS METHYL ACRYLATE, AND OPTIONALLY, A POLYOL, SUCH AS GLYCERINE, WHICH IS CROSS-LINKED INSITU TO INCREASE TENSILE STRENGTH. THIS BLEND IS THEN FOAMED WITH CONVENTIONAL BLOWING AGENTS.
Inventors
- 👤 Wayne E Smith
- 👤 Francis R Galiano
- 👤 Richard H Havens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:39
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2395/00; C08J2423/00
Claims Analysis
Total Claims: 0
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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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |