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LOCKFORMER, CO. v. PPG INDUSTRIES
March 24, 2003
THE LOCKFORMER COMPANY, PLAINTIFF, AND TRUSEAL TECHNOLOGIES, INC., CROSS-CLAIM DEFENDANT,
PPG INDUSTRIES, INC., DEFENDANT, AND PPG INDUSTRIES, OHIO, INC., CROSS-CLAIM PLAINTIFF.
The opinion of the court was delivered by: Amy J. St. Eve, United States District Court Judge
MEMORANDUM OPINION AND ORDER
Lockformer, an Illinois corporation, makes and sells machinery used to manufacture metal spacers for double-glazed windows known as insulated glass units ("IGU"s). (R.159-1, Pl.'s Statement of Material Facts on Infringement ¶ 9.) An IGU is manufactured by attaching two panes of glass to the opposing sides of a spacer.*fn1 TruSeal is an Ohio corporation that sells components and machines for use in the IOU industry. (R.152-1, Pl.'s Statement of Material Facts on Validity ¶ 2.) TruSeal is the exclusive distributor of Lockformer's IGU manufacturing machinery. (Id.) It makes a desiccant*fn2 called RL-50 that is used in making IGUs. (R. 159-1, Pl.'s Statement of Material Facts on Infringement ¶ 9.) Defendant PPG Ohio owns the '916 patent and licenses it to Defendant PPG Industries. (Id. ¶¶ 3-4.)
Judge Coar presided over this case until it was reassigned to this Court on September 12, 2002. Judge Coar explained the history of this case in an August 25, 2001 opinion. See Lockformer Co. v. PPG Indus., Inc., 2001 WL 940555, at *1 (N.D. Ill. 2001). The Court will briefly sum up those facts. Lockformer filed a complaint against Defendants on October 15, 1999. Its amended complaint, filed on January 31, 2000, seeks a declaration that it does not infringe the '916 patent and that the patent is invalid and unenforceable. Defendants countered with a patent infringement claim against Lockformer and third-party defendant TruSeal. Judge Coar held a Markman hewing on December 21, 2000 and construed the '916 patent in his August 25, 2001 order.
III Patent Claim And Markman Hearings
Claim 1 is the only independent claim of the '916 patent. It claims protection for:
A strip to be shaped into spacer stock for maintaining
adjacent glass sheets of an insulating unit in a
predetermined spaced relationship to one another, the
 an clongated flat bendable metal substrate have
opposed major surfaces, at least one of the surfaces
being fluid impervious, said substrate having a
structural stability sufficient to maintain adjacent
glass sheets in the fixed relationship when said
substrate is shaped into the spacer stock;
 an elongated bead of fluid previous adhesive
adhered directly to one of said major surfaces spaced
from the edges of said substrate, said adhesive having
structural stability less than ...
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