Is a partnership between patent attorneys A and B, which restricts them from accepting each other's clients, valid?

A partnership between patent attorneys that includes a restriction on accepting each other's clients is considered invalid due to ethical rules that govern the conduct of lawyers. Such a restriction can create conflicts of interest and would hinder the attorneys' ability to represent clients effectively. The rules of professional conduct generally require attorneys to act in the best interests of their clients, which includes the obligation to provide competent and diligent representation without arbitrary barriers to client access.

Moreover, this type of agreement may lead to potential violations of antitrust laws by restricting competition and client choice in the marketplace for legal services. By not allowing each partner to accept clients who might benefit from their expertise, the partnership could ultimately harm clients' interests and compromise the duties owed to them.

In summary, any arrangement that would limit an attorney's ability to fully serve their clients or restrict competition is not in alignment with the ethical standards upheld in the legal profession, making the partnership's condition invalid.