The first match was accidentally discovered in 1826 when John Walker scraped a stick with chemicals on the end against a stone floor.
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 4822560 | Copper alloy and method of manufacturing the same A copper alloy is disclosed which comprises 0.01 to 1.0 wt. % of Cr, 0.01 to 8 wt. % of Sn, 0.001 to 5 wt. % of at least one of 0.001 to 5 wt. % of Zn, 0.001 to 0.5 wt. % of Mn and 0.001 to 0.2 wt. % of Mg and the remainder of Cu, the content of O2 | 04/18/1989 |