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CoolSavings sued IQ.Commerce Corporation over the '648 patent in the iSave coupon program. The case settled in Dec. 2000 with IQ acknowledging validity of the '648 patent and receiving a limited, royalty-bearing license plus an option for an unlimited license. The N.D. Ill. personal-jurisdiction/venue opinion is reported at CoolSavings.com, Inc. v. IQ.Commerce Corp., 53 F. Supp. 2d 1000 (N.D. Ill. June 10, 1999).

CoolSavings sued Planet U over the '648 patent. The case settled in July 2000 by cross-license: each party recognized the validity of the other's patent, and Planet U agreed to pay CoolSavings licensing fees reportedly possibly exceeding $1 million. Planet U also counterclaimed against CoolSavings and Pep Boys, asserting its own patent 5,907,830 ('Electronic coupon distribution,' Peter Engel), which was resolved by the same settlement.

CoolSavings sued Emaginet Inc. (later/reportedly known as e-centives Inc.) over the '648 patent, filing by Oct. 20, 1998 (reported as filed Aug. 1998). E-centives counter-sued CoolSavings for infringement in D. Maryland on April 27, 1999, asserting a purchased patent ('Electronic couponing method and apparatus'). The case settled after E-centives' validity/obviousness defense.

CoolSavings sued CouponSurfer.com over the '648 patent in 1998. The case settled in May 1999 with a paid license; CouponSurfer was permitted a limited form of the patented technology.

CoolSavings sued iVillage.com over the '648 patent in 1998. The case settled, reported in 1999.

CoolSavings sued emaildirect inc. ('Value-mail') over the '648 patent in 1999. The case settled; emaildirect agreed the patent was valid and enforceable and would not challenge validity, and the license limited it to six targeting data points.

CoolSavings sued Hot Coupons over the '648 patent in 1998. The case settled around 2001; Hot Coupons agreed to pay a royalty for a limited license.

CoolSavings sued BrightStreet.com over the '648 patent in 1998-1999. The case was reported as still pending in ~2000-2001 CNET/Chief Marketer reports; final disposition not confirmed.

Xadvantage was named among CoolSavings' suits in Japanese/Korean business-patent case studies (approx. 1998-2000). Outcome not confirmed.

Catalina Marketing International was one of the defendants CoolSavings sued over the '648 patent as part of its enforcement campaign. Catalina responded with its own patent suit, Catalina Marketing International, Inc. v. CoolSavings.com, Inc., N.D. Ill. No. 00 C 2447, asserting U.S. Patent No. 4,674,041.