is a member of SK Intellectual Property Law Firm, located in Tokyo, Japan. He focuses his practice in the fields of biotechnology, pharmaceuticals, chemistry, and medical device, willing to help domestic clients and clients overseas to file and prosecute a patent application with Japan Patent Office. He is also a patent search expert and involved patent challenges to several pharmaceutical patents in Japan. He runs the website https://japanese-patent.com/, providing information about patent practice and law firms in Japan.
For more information or to contact Daisuke please visit his Firm Profile Page.
An antibody can take various forms, including the following: a monoclonal, polyclonal, mouse, human, humanized, monospecific, bispecific, glycosylated (sugar chain-modified), Fc-modified, or ADC (antibody-drug conjugate) antibody; an antibody fragment (e.g., Fab, scFv, diabody, sdAb, tandem scFv); or an antibody of different class or subclass (e.g., IgG (e.g., IgG1, IgG2, IgG3, IgG4), IgM, IgE, IgA). If claim 1 recites an “antibody”, whether or not the antibody includes each of the above forms can be an issue in an infringement lawsuit. In Baxalta Inc. v. Genentech, Inc. (Fed. Cir. 2020), Baxalta alleged that Genentech’s Hemlibra® (emicizumb-kxwh) product infringed its U.S. Patent No. 7,033,590 (’590 patent). In this lawsuit, the issue was whether or not the “antibody or antibody fragment thereof” in claim 1 of the ‘590 patent should comprise a bispecific antibody (the form of Hemlibra).
Patents involving antibody medicines (antibody patents) are largely grouped into patents specified by antibody amino acid sequences (antibody sequence-based patents) and those not (non-sequence-based patents). Non-sequence-based patents have a broad scope and are thus very useful for protecting antibody medicines. Here, I investigate a recent trend in antibody patents characterized by an antibody-binding site in an antigen.