Famous Patents
Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 6834583 | Silk screen assembly A stencil screen with a desired pattern to be imprinted is supported on a stencil screen frame. The frame has upstanding elongated sidewalls joined by spaced apart end walls to circumscribe a screen window opening. The stencil screen has sufficient strength transver... | 12/28/2004 |
| 4520727 | Method and apparatus for silk-screen printing Method and apparatus for printing a design with a stencil screen including a resilient membrane formed by reversely-bent portions in the screen between a desired pattern defined by a paint-pervious opening in the screen and edge portions of the screen. Th... | 06/04/1985 |
| 4137842 | Method and apparatus for applying decorative imprints to the surfaces of plastic workpieces System for applying decorative imprints to the surfaces of plastic workpieces by means of a heated silk-screen technique wherein the screen is initially coated with a silicone release agent which prevents sticking of the heated screen to the plastic workp... | 02/06/1979 |
