Possible short story from 60’s or 70’s about man who invents a force field bubble by accident in home using simple items then government tries to take it away, he discovers fields properties as he defends himself from attempts to force him giving it up by using force fields size and opacity to incursions to defend himself

Possible short story from 60’s or 70’s about a man who invents a force field bubble by accident in his home using simple items then the government tries to take it away. He discovers the fields properties as he defends himself from attempts to force him to give it up by using the force fields size and opacity to incursions to defend himself.