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 |
| 7171864 | Method for testing writing instruments The present invention concerns a method for controlling writing instruments, in particular ball-point pens, on paper, which consists in guiding the writing instrument relative to the paper plane in a repeated movement and displacing the paper in forward direction. T... | 02/06/2007 |
| 4580438 | Method and apparatus for testing the duplicating characteristics of pressure-sensitive duplicating sheets In a method and apparatus for testing the duplicating characteristics of pressure-sensitive duplicating sheets and duplicating sets produced therefrom, a stroke grid is drawn on the duplicating sheets to be tested by means of a marking stylus which is act... | 04/08/1986 |
| 4142106 | Transfer printing ribbon error detection system Errors occurring during the printing of characters in an impact printer using transfer ribbon are detected by scanning the ribbon optically after the printing operation using a slit scanner and analyzing the resulting signals to determine the value of the... | 02/27/1979 |
| 4122702 | Apparatus for testing a forms set for print through quality Apparatus for testing the print through quality of a forms set. The apparatus comprises a horizontal base plate which is adapted to have the forms set laid thereupon. Sleeve means is mounted above the base plate for guiding a hammer for vertical movement ... | 10/31/1978 |
