1) Room temperature superconductors
https://patents.google.com/patent/US20190058105A1/en
2) An "inertial mass reducing device" (a.k.a. UFO tech)
https://patents.google.com/patent/US20170313446A1/en
3) A gravitational wave generator
https://patents.google.com/patent/US10322827B2/en
I find it absolutely ridiculous these patents are granted without working prototypes.
1) Room temperature superconductors
https://patents.google.com/patent/US20190058105A1/en
2) An "inertial mass reducing device" (a.k.a. UFO tech)
https://patents.google.com/patent/US20170313446A1/en
3) A gravitational wave generator
https://patents.google.com/patent/US10322827B2/en
I find it absolutely ridiculous these patents are granted without working prototypes.