When an employee creates an invention and then patents it, there then arise issues as to who owns the patent. Sometimes its the employee, other times its the employer.
The general rule is that an individual owns the patent rights to an invention if he or she is an inventor, even though the invention was conceived and/or reduced to practice during the course of his or her employment. But there are two exceptions to this general rule:
First, where an employee has entered into an express contract which assigns the employee’s inventions to his or her employer, then the employer owns whatever rights it has under the contract.
Second, where an employee is hired to invent something or to solve a particular problem, then the employer owns the patent rights to inventions made within that scope.
Nonetheless, simply because an individual is employed does not necessarily mean that the employer owns all rights to a patentable invention developed by an employee. If an employee’s employment is “general”, then ownership of the patent will belong to him/her. On the other hand, if an employee is an officer of the employer, then typically any inventions created by him or her will be owned by the employer. This is true, even if the employee creates the invention at home and on his/her own time. But this result is due more to the status of the employees as an officer of a corporation who has a fiduciary duty to the corporation, e.g. to assign all inventions created by him/her to the corporation.
In contrast, if an employee is hired for general services and the employee invents something at home and on his own time, the invention is owned by the employee.
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