Polaroid (polarizer) Polaroid (polarizer) Polaroid is a type of synthetic plastic sheet which is used as a polarizer or polarizing filter. A trademark of the Polaroid Corporation, the term has since entered common use. The original material, patented in 1929 and further developed in 1932 by Edwin H. Land, consists of many microscopic crystals of iodoquinine sulphate (herapathite) embedded in a transparent nitrocellulose polymer film. The needle-like crystals are aligned during manufacture of the film by stretching or by applying electric or magnetic fields. With the crystals aligned, the sheet is dichroic: it tends to absorb light which is polarized parallel to
Polaroid Corporation the past bought up failed companies with well-known names for the value of those names. The same year, Flextronics purchased Polaroid's manufacturing operations and the decision was made to send most of the manufacturing to China. It stopped making Polaroid cameras in 2007 and discontinued the sale of Polaroid film after 2009 to the dismay of loyal consumers. On December 18, 2008, the post-reorganization Polaroid Corp. filed for Chapter 11 bankruptcy protection in U.S. Bankruptcy Court for the District of Minnesota. The bankruptcy filing came shortly after the criminal investigation of its parent company, Petters Group Worldwide, and the parent