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| All Patents in class 521/174 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,666,848 | May 30, 1972 | R.C. Harper | Method of Producing Closed Mold Polyurethane Foam Moldings Free of Surface Voids by Flushing the Mold with a Vaporized Halogenated Hydrocarbon | manufacturing processes | |
| 3,745,203 | Jul. 10, 1973 | R.C. Harper | Process for Molding Polyurethane Utilizing a Mixture of Two Blowing Agents | manufacturing processes | |