Robert William Croop

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Littleton, CO, US

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Patents Grantslast 30 patents

Information Patent Grant
Roofing shingle utilizing an asphalt composition and method of maki...
- Patent number 3,931,440
- Issue date Jan 6, 1976
- Johns-Manville Corporation
- Philip Bickford Shepherd
- D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...