There exists no provision that allows the Courts to recognize the right of an employer over an invention created during the course of employment.
2)the Indian Patents Act, 1970 considers the inventor to be the first and foremost owner of an invention.
3) you have not signed a pre-invention assignment that bestows all rights to the employer over any inventions that the employee creates during the completion of normal duties assigned to him.
4) you can apply for parent in sister name