Here's an expired patent you can take advantage of: https://patents.google.com/patent/US3216423A/en https://patents.google.com/patent/US3216423A/en Succinctly

Here's an expired patent you can take advantage of: https://patents.google.com/patent/US3216423A/en https://patents.google.com/patent/US3216423A/en Succinctly named "Apparatus for facilitating the birth of a child by centrifugal force"