SEC. 5. The Commissioner of Patents shall give advice of a scientific and legal character as he may be desired and qualified to do, to inventors. He may guaranty the originality of any invention at his own risk, at any price be may agree upon with any inventor to give certificates thereof, and this shall not interfere with his regular salary. But it is provided that the Commissioner shall not in any manner prevent others from examining and guarantying the originality of any invention for which a patent may be desired. And it is also provided that any Commissioner, Register, Clerk, Attorney, Examiner or Agent, who may give a guaranty or warrant of the novelty of any invention shall be held responsible in costs on any information to be filed by any party who may feel himself aggrieved, to rescind the patent which may not be an original invention of the claimant so guarantied. SEC. 6. To rescind a patent, any party feeling himself aggrieved may file information in the District Court of the United States, of the district in which the patentee resides, notifying the patentee of such information filed, with what the former intends to prove, and where the patentee may discover the evidence relied upon by the informer, on which, the patentee may surrender his patent without costs should he so elect. But should the patentee determine to stand trial, he shall plead to such information within twenty days, denying the allegations of the informer, on which the trial shall proceed in its regular order on the calendar, and the patentee, if found wilfully and knowingly a monopolizer of the public rights, shall suffer costs and the reasonable expenses and counsel fee of the informer. And if such inventor shall make oath he has not been enabled to examine the proofs on which the informer relies to rescind his patent, he shall be allowed such further time as the court having jurisdiction may prescribe. And the court may make an order to the informer to exhibit fully his evidence of priority of invention, and no other evidence than has been exhibited to the inventor excepting rebutting, shall be introduced on the trial to rescind the patent. SEC. 7. The Commissioner of Patents shall collect and keep in the Patent Office all the scientific works published and useful for references, and pay the expenses of the same from the patent fund. But the Commissioner shall not subscribe for more than three copies of any publication for the use of the office as aforesaid out of the Patent Fund. SEC. 8. The application of any known machinery or matter of combination of machinery, or matter to new purposes or old purposes after a new method, or any means by which useful results are to be more advantageously produced than formerly, shall be the subject of a patent. SEC. 9. A method, plan, design, or any new and useful idea, which can be defined, shall be the subject of a patent.