The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 31, 1991
Filed:
Apr. 05, 1990
James H Harper, St. Paul, MN (US);
Raymond E Grunzinger, Jr, St. Paul, MN (US);
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
A pavement marking material comprises a flexible base sheet that is conformable to an irregular pavement surface. A durable, wear-resistant, polymeric top layer is adhered to one surface of the base sheet. The top layer is capable of undergoing brittle fracture at a temperature from 0.degree. C. to 45.degree. C. such that when the base sheet conforms an irregular surface, the top layer readily forms ruptures to relieve stress build-up in the top layer as the regions of the top layer defined by the ruptures remain adhered to, and follow the conformance of, the base sheet. A plurality of particles are embedded in and protrude from the top layer. The particles comprise retroreflective beads and skid-resistant granules. In a preferred embodiment, the top layer is characterized by a Young's modulus of from about 50,000 psi to about 300,000 psi, and a percent elongation at break of from about 4% to about 35%.