Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 6626198 | Resilient stave support assembly for umbrella An umbrella a fixed ring secured on top of a rod, a middle ring and a lower ring slidably engaged on the rod, a number of main staves having inner ends rotatably securing to the middle ring, a number of upper staves pivotally coupled between the fixed rin... | 09/30/2003 |
| 4884586 | Rib coupling for hat-like umbrellas A coupling device for a hat-like umbrella frame consisting of a coupling member and a rib stretcher. A visor rib comprising an outer segment with a smaller diameter than the inner segment thereof is pivotably connected to a main rib and a respective rib s... | 12/05/1989 |
| 4838290 | Slimly-folded umbrella having extendible brim portion An umbrella includes a plurality of main links for securing an umbrella cloth and several shortened links each pivotally connected with a tail link which is operatively suspended horizontally to a stretcher link by a supporting link when opening an umbrel... | 06/13/1989 |
