Do they have anti-gravity space vehicles?

According to the u.s patent office they do... where is it?

Anti gravity space vehicle is not a big secret neither is it a problem for Engineers to create gravity or oppose the force of gravity inside a space ship and thus make astronauts function as if they were on the planet Earth. I haven't looked any where in the books to answer your question, but the idea of creating a vehicle that makes space travelers live normally inside is in my mind since college years. It has never been a problem to design one with that specification. All our satellites and space shuttles create anti gravity situation not because they are in the space, but because they control and oppose the force of gravity through their knowelge of Physics.

Let me show how we can create a space ship that travels having people walk inside it as if they are on the planet earth. All what we should do is make that space ship rotate around its self or its own axis if it is a big space ship. The rotation velocity around itself must be according to this equation:

V^2/r = g
Where v equals the velocity of the spaceship rotation and r is the radius of the axis of rotation of the space ship. Perhaps if you have ever seen the movie 2001 space odyssey, you would understand exactly how to create gravity inside the space ship.
g is the gravity of the Planet Earth which is 9.8 m/s^2
If we have a space ship that rotates around its axis which measure to be 500 meters, then we should have the space ship rotate according to the following equation:

V^2/r = 9.8
Or v^2 = 9.8*500meters
Or v = 70 meters per second.
Design a space ship that travels in space to any bearing desired having in mind that it must rotate around itself with a speed = 70 meters per second.

With a space ship of this specification you can live inside the ship like you see Captain Jim Kirk inside his ship The United State Enterprise.

Another way of traveling with anti gravity inside the space ship is to make the ship travel with constant acceleration = g. All you have to do then is to design a space ship whereby you can see your heading while you are standing opposite to the vector of the ship speed. There should be certain adjustment made from time to time because if you continue to travel with the continuous acceleration equaling to g, you would apparently reach the speed of light which is impossible to reach and remains the current problem for man to solve in our current times.

If we had such a thing, it would be classified. To keep giving us an edge over other countries in the world.