Did You Know...
...that "patent leather" got its name because the process of applying the polished black finish to leather was once patented?
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| Number | Title | Issue Date |
| 5551153 | Razor blade assembly A twin-blade assembly is formed from two blade steel members (A, B) shaped to have rear mounting legs (3A/B), spring arms (9A, 9B) at opposite ends of the unit, downturned legs (2A, 2B) for reinforcing the members and sharpened blade edges (1A, 1B) on bla... | 09/03/1996 |
| 4860452 | Single edge razor blade with integral back This invention relates to razor blades and more particularly to a single edged blade for shaving or scraping. The blades are reinforced in various ways to make them stiff enough for scraping.... | 08/29/1989 |
| 4858323 | Integrally backed single-edge razor blade An integrally backed single-edge razor blade has a plurality of projections struck from a margin of the blade remote from its cutting edge. The struck portions reinforce the blade and afford a blade edge remote from the cutting edge having a thickness gre... | 08/22/1989 |
