Rule 501.   When the applicant dies; becomes insane.    In case the applicant dies, becomes insane or incapacitated, the legally appointed administrator, executor, guardian, conservator, or representative of the applicant, may sign the application papers and other documents, and apply for and obtain the patent in the name of the applicant, his heirs or assignee.  

Rule 502.  Assigned invention and patent.  In case the whole interest in the invention is assigned, the application may be filed by or in the name of the assignee who may sign the application. In case the assignee is a juridical person, any officer thereof may sign the application in behalf of the said person.  In case of an aliquot portion or undivided interest, any of the joint owners will sign the application.  

Rule 503.   Juridical person; definition.    A juridical person is a body of persons, a corporation, a partnership, or other legal entity that is recognized by law which grants a juridical personality separate and distinct  from that of a share holder, partner or member.  

Rule 504.  Proof of authority.  If the person who signs the application in behalf of a juridical person is an officer of the corporation, no proof of authority to file the said application will be required.  However, if any other person signs for and in behalf of a juridical person, the Bureau shall require him to submit proof of authority to sign the application.  

If the applicant appoints a representative to prosecute and sign the application, the Bureau shall require proof of such authority.  

Rule 505.  Forms of signatures.   Where a signature is required, the Office may accept:  

(a) A handwritten signature; or  

(b) The use of other forms of signature, such as a printed or stamped signature, or the use of a seal, or thumb marks, instead of a handwritten signature:  Provided, That where a seal or a thumbmark is used, it should be accompanied by an indication in letters of the name of the signatory.