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| All Patents in class 548/349.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,950,211 | Aug. 23, 1960 | C.F. Huber, P.F. Thompson | Heterocyclic Asphalt Additives | manufacturing processes | |
| 3,037,029 | May 29, 1962 | P.F. Thompson, C.F. Huber | Imidazoline Compounds | manufacturing processes | |