A toy pistol that blows soap bubbles.
American Almon B. Strowger patented the first automatic switchboard
patented the roller coaster
The Bessemer converter was patented in 1855.
no, it was patented first by him.
The purpose of a patent is to give you ownership of the product you invent. If you want to make money or sell the product you invent, you must have it patented as almost all potential buyers will not but the product if it is not patented.
His pendulum clock was patented in 1657.
He did not invent the escalator or the fountain pen. He first of all was to busy to invent stairs that move. Second he patented the fountain pen he did NOT invent it
10 bc He did not invent the first vacuum cleaner but he patented his invention in 1901.
10 bc He did not invent the first vacuum cleaner but he patented his invention in 1901.
He patented it in 1846.
Osborne Dorsey didnt invent the doorknob he only improved it and patented it in 1878
Her invention was first patented in 1969.