Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 5810523 | Apparatus for drilling a hole having an undercut space It is the object of the present invention to drill a hole and, at the same time, transmitting an application force exactly to an undercutter for forming an undercut space in the cylindrical wall of the hole at a position near the hole bottom. An apparatus... | 09/22/1998 |
| 5423111 | Magnetic disk tester A magnetic disk tester according to the present invention comprises a first head moving mechanism for fixedly mounting a first certification testing head and a burnishing head perpendicularly of a moving direction thereof and a second head moving mechanis... | 06/13/1995 |
| 5331871 | Method of turning grooves A method of turning very small grooves into a hardened steel work piece using a precision or ultraprecision lathe. Positioning of the work piece on the lathe spindle and dressing the work piece to minimize runout, aligning the cutting tool with the face o... | 07/26/1994 |
| 5018257 | Magnetic sheet polishing device A magnetic sheet polishing device including a scraper having a sliding surface and a downstream side surface that is nearly perpendicular or at an acute angle to the sliding surface to ensure that magnetic material powder spontaneously falls away from and... | 05/28/1991 |
| 4976020 | Magnetic sheet polishing device A magnetic sheet polishing device including a scraper having a sliding surface and a downstream side surface that is nearly perpendicular or at an acute angle to the sliding surface to ensure that magnetic material powder spontaneously falls away from and... | 12/11/1990 |
| 4936180 | Apparatus for machining workpieces, particularly flat circular disk-shaped substrates A lathe apparatus for machining flat, circular disk-shaped recording media, for example, audio, video or ROM compact disks, for the purpose of improving their surface quality and their dimensional stability is provided which comprises a driven lathe spind... | 06/26/1990 |
| 4597700 | Record engraving apparatus A record engraving apparatus having a table with a vacuum source for retaining thereon a master lacquer with portions thereon having pre-recorded disc-shaped record portions. The rotatable table is precisely positionable in all directions of the plane of ... | 07/01/1986 |
| 4264254 | Article transfer apparatus A transfer arm includes a magnet which can be placed in alignment with the spindle aperture of a recording disc. A spindle is mounted to a support at a stacking station for receiving the aperture of the disc on the transfer arm when the disc is released. ... | 04/28/1981 |
| 4235136 | Trimming disc records A record transfer press including an apparatus for trimming flash from a disc record, said apparatus having a relatively movable drive means and trimming head.... | 11/25/1980 |
