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:
Mar. 13, 2007
Filed:
Oct. 20, 2003
William L. Melbye, Woodbury, MN (US);
Susan K. Nestegard, St. Paul, MN (US);
Leigh E. Wood, Woodbury, MN (US);
Marvin D. Lindseth, Prescott, WI (US);
Dale A. Bychinski, Woodbury, MN (US);
William L. Melbye, Woodbury, MN (US);
Susan K. Nestegard, St. Paul, MN (US);
Leigh E. Wood, Woodbury, MN (US);
Marvin D. Lindseth, Prescott, WI (US);
Dale A. Bychinski, Woodbury, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A mushroom-type hook strip for a hook-and-loop fastener has a flexible backing of thermoplastic resin and, integral with backing, an array of upstanding stems distributed across at least one face of the backing, each having a mushroom head. The stems have a molecular orientation as evidenced by a birefringence value of at least 0.001. The mushroom-type hook strip can be produced continuously by injecting resin into cavities of a cylindrical mold while evacuating and cooling the cavities so that the cooled resin becomes molecularly oriented, thus affording to the stems excellent stiffness, durability, and tensile and flexural strength.