Amendments to patent laws. Hearings before the Committee on patents, House of representatives, Seventy-sixth Congress, third session, on H.R. 8441, a bill to afford greater protection to the purchaser of patent rights; H.R. 8442 (and substitute H.R. 9616) a bill to prohibit proof of acts done by an inventor in foreign countries; H.R. 8444, a bill to permit the assignee of an application for letters patent to make certain supplemental applications; H.R. 9384, a bill to simplify the practice in cases where a patent is or may be in part valid and in part invalid; H.R. 9386, a bill to improve the practice concerning applications for patents made by plural applicants and patents issued thereon, to provide for applications in certain circumstances by assignees of inventors, and to simplify the formal application papers; H.R. 9388, a bill to protect inventors whose first application for patent was filed in a foreign country from undue limitations of their rights to obtain United States patents. May 9 and 16, 1940.