I'll research this entity.
Allis — company profile
Identification and caveat. The database holds one case for "Allis": Allis v. Freeman, in which Allis is plaintiff, in the U.S. Circuit Court for the W.D. Wisconsin. The U.S. Circuit Courts were abolished in 1912, so this is a pre-1912 matter. I could not locate a reported decision for Allis v. Freeman in public sources, so the identification below is inferential. The name is not matched in public records to any current company; I found no verifiable headquarters, ownership status, employee count or revenue for the "Allis" entry as such, and nothing indicates an NPE.
Most consistent identification. The entity is most likely the Milwaukee machinery business of Edward P. Allis (E.P. Allis & Co., the Reliance Works), founded in Milwaukee, Wisconsin, in the early 1860s and a manufacturer of flour-milling machinery, sawmill machinery, steam engines and heavy industrial equipment. After Allis's death the estate's family agreement of February 1890 provided for a Wisconsin corporation, the Edward P. Allis Company, capitalized at $1,500,000 — facts recited in the Wisconsin Supreme Court's Estate of Allis decisions (163 Wis., 191 Wis. 23). In 1901 that business combined with Fraser & Chalmers and Gates Iron Works to form Allis-Chalmers, later a large public manufacturer of farm, construction and power equipment, dismantled in the 1980s–90s (AGCO acquired the tractor business; Siemens the energy business). I could not verify the specific corporate lineage from the 1890s firm to the case.
Litigation posture. The data show one case, plaintiff-side, zero as defendant — consistent with an operating manufacturer enforcing patents rather than a non-practicing entity. Contemporaneous litigation fits that pattern: Allis v. Stowell (16 F. 783), where Allis enforced the Beckwith sawmill "dog" patent against purchasers of rival devices, and the court noted Allis had "commenced a large number of suits"; Neacy v. Allis and Wise v. Allis (76 U.S. 737, 1869, millstone-balancing patent) involved Allis as defendant. No plaintiff-friendly modern venue (e.g., E.D. Tex.) appears.
Disambiguation. An unrelated Milwaukee electric-motor maker, Louis Allis Company, appears in patent litigation (Sterling Varnish Co. v. Louis Allis Co., 1957), and a same-name 2024 W.D. Wis. case, Allstate Insurance Co. v. Freeman, is a trade-secrets dispute. Neither should be conflated with this entry without verification.