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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 |
| 7511571 | Single-ended screen-regulated cathode-follower output stage for high-fidelity music amplifier A novel single-ended screen-regulated cathode-follower output topology for implementing vacuum-tube audio power amplifiers for the reproduction of high-fidelity music with minimal audible distortion. The screen regulation substantially reduces the distortions and no... | 03/31/2009 |
| 6265938 | Linear high-voltage drive stage and cathode-follower high-fidelity power amplifier implementing same A novel drive stage provides with low distortion a large amplitude signal, such as required for driving a cathode-follower output stage of a power amplifier. The drive stage comprises an amplification substage and a load substage. Each substage comprises ... | 07/24/2001 |
| 5859565 | Cathode-follower high-fidelity power amplifier A cathode-follower power output stage is driven by a novel drive stage to provide with low distortion the large signal required to drive the output stage. The drive stage comprises two series connected vacuum tubes which share the large static and dynamic... | 01/12/1999 |
| 4324950 | Amplifier for driving electrostatic loudspeakers An amplifier for a capacitive load which includes a pair of high-voltage tube output circuits connected in a power output tube arrangement operating in push-pull for driving a capacitive load together with a feedback network connected between the Schmitt ... | 04/13/1982 |
