Weatherchem Corporation is a Twinsburg, Ohio–based manufacturer of plastic dispensing closures, founded in 1971 when Albert J. Weatherhead III acquired Ankeny Co. and renamed it. Its address of record is 2222 Highland Road, Twinsburg. It is privately held: in November 2012 Mold-Rite Plastics, then a portfolio company of private equity firm Irving Place Capital, acquired Weatherchem and retained the Weatherchem name and brand (Crain's Cleveland Business; Packworld; Mergr). Irving Place later sold Mold-Rite to Clearlake Capital in 2021, and the Twinsburg plant now operates as a Mold-Rite Plastics facility with roughly 200 local employees. Plastics News reported Weatherchem sales of about $55 million in 2011; current standalone financials are not disclosed.
Operations. Weatherchem designs and injection-molds polypropylene dispensing closures for containers and bottles. Named product lines include the original Flapper® closure, FlapMate®, LiquiFlapper®, NutraFlapper®, NutraGen II®, Grinder NR and later MegaFlap®, used in spices and seasonings, dry foods, liquid condiments, healthcare/nutraceuticals, personal care, pet care and household chemicals (company releases; Wikipedia; PitchBook).
Litigation posture. This is an operating company, not a non-practicing entity. The structured data show one tracked case, filed by Weatherchem as plaintiff and none as defendant — a single offensive patent suit against a competitor, rather than a defense against NPEs or an acquired-portfolio assertion campaign. The case was filed in the Northern District of Ohio (Judge Kathleen M. O'Malley), Weatherchem's home venue, not a plaintiff-friendly district such as the Eastern District of Texas.
Notable case. Weatherchem Corp. v. J.L. Clark, Inc. asserted the '399 and '494 patents on two-flap "shake-and-spoon" condiment caps. The district court held the claims invalid under the on-sale bar, finding the patented cap was offered for sale to Durkee Foods in 1985 (937 F. Supp. 1262). The Federal Circuit affirmed invalidity in 1998 (163 F.3d 1326), vacating the judgment of noninfringement. No later Weatherchem litigation appears in the tracked data.