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 claim], follows US District Judge James Rosenbaum's ruling on Thursday in Minneapolis that putting the purchase on hold during appeal would threaten operations at Polaroid, which is spending its cash at a rate of $3 million a month. On April 16, 2009, Polaroid won US Bankruptcy Court approval to be sold to a joint venture of Hilco Consumer Capital LP of Toronto and Gordon Brothers Brands LLC of Boston. Hilco Consumer Capital and Gordon Brothers Brands announced the closing of the purchase of Polaroid Corporation on May 7, 2009, placing Polaroid Corporation in joint holding under a parent company named