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:
Jun. 27, 1995
Filed:
May. 27, 1994
Ralph H Bland, St. Paul, MN (US);
James M Jonza, Round Rock, TX (US);
James D Smith, St. Paul, MN (US);
Richard C Allen, Mendota Heights, MN (US);
Jeffrey F Bradley, Woodbury, MN (US);
Kenneth B Smith, Shoreview, MN (US);
Bruce D Stambaugh, Anaheim, CA (US);
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
A tear resistant film comprises more than five layers situated one on the other in a parallel array. The layers are individually selected from a stiff polyester or copolyester, a ductile polymeric material, and optionally, an intermediate material. The stiff polyester or copolyester is oriented in at least one direction. Tear resistance may be measured in a Graves area test and reflects the ability of the film to absorb energy. The films of the invention are useful in many articles including security control laminates for glazing members.