Famous Patents
The ice cream cone was invented at the St. Louis Worlds Fair by Ernest Hamwi in 1904. His waffle booth was next to an ice cream vendor who ran short of dishes. Hamwi rolled a waffle to hold ice cream and the cone was born.
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| Number | Title | Issue Date |
| 5515011 | Pulsed magnetron circuit with phase locked loop A semiconductor diode is connected across the cathode-to-anode path of a magnetron and through a storage capacitor and collector resistor to a supply voltage for enabling charging of the capacitor. A control pulse causes a switching transistor to conduct ... | 05/07/1996 |
| 4162459 | Magnetron tuning circuit A circuit for the modulation of the frequency of radiation produced by a magnetron includes a directional coupler connected to the output port of the magnetron, a circulator coupled between the output port and a load, and a phase shifter connected between... | 07/24/1979 |
