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 |
| 6655697 | Piston oil ring having land flanked by concave sidewalls An oil control ring for a piston of an internal combustion engine has an annular body defining a central axis. The ring has a U-shaped cross-section formed of a centrally positioned web extending parallel to the axis and a pair of axially spaced rail port... | 12/02/2003 |
| 5560278 | Hydraulic cylinder with an electrical contacting and sealing ring A coaxial capacitor contacting and sealing structure, for electrical continuity between parts that move in relation to each other at the ends of a cavity within a hydraulic cylinder employing electromagnetic wave position sensing. The structure employs a ... | 10/01/1996 |
| 4384554 | Piston ring with expander for internal combustion engine A piston ring for use with an oblong piston and cylinder has a gap at one end. A resilient corrugated expander is positioned behind the piston ring and within the piston ring groove in the piston. The expander also has a gap and the two gaps are adjacent ... | 05/24/1983 |
| 4362135 | Piston ring of internal combustion engine An internal combustion engine is provided with at least one oblong cylinder and an oblong piston mounted to reciprocate therein. A piston ring is positioned within an annular piston ring groove formed in the piston, the piston ring including an outer ring... | 12/07/1982 |
| 4317574 | Expander for piston ring An expander device for a piston ring comprises a plurality of corrugated resilient expander elements placed one upon another with the corrugations fitted to each other.... | 03/02/1982 |
| 4266787 | Piston ring A piston ring for an oblong piston is adapted to be received in a peripheral groove on the piston. The piston ring is split and the gap between the split ends is located at the center of one of two spaced curved sections of said piston ring. A corrugated ... | 05/12/1981 |
| 4132420 | Sealing rings for stirling engines Sealing rings located in an annular recess about a piston in a Stirling engine have a continuous sealing ring of polymeric material having an L-shaped cross-section producing an annular flange abutment. A second discontinuous polymeric ring has a surround... | 01/02/1979 |
