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 |
| 7293573 | Umbrella frame and operating system An improved, durable and versatile umbrella frame assembly is provided to more readily endure abusive weather conditions and that may be quickly, easily and inexpensively repaired. In addition, the assembly is also easily modified to accommodate umbrella canopies of... | 11/13/2007 |
| 6941958 | Umbrella device An umbrella device which has a shank, an umbrella-like cap formed as a membrane and a driver. The membrane is connected to the shank and is caused by the driver to move from a position of rest where it droops limply around the shank to an open position where it is e... | 09/13/2005 |
| 6216712 | Catch-free safety umbrella A safety umbrella includes: a central shaft; a rib assembly having a plurality of top ribs pivotally secured to an upper notch on the shaft each top rib pulled by a pulling rope to be tensioned towards an upper portion on the shaft, and a plurality of str... | 04/17/2001 |
| 5069237 | Disposable umbrella A disposable umbrella apparatus is made of thermoplastic and inexpensive materials and has a central staff made of a length of plastic pipe. Three short plastic dowels are mounted perpendicular through the staff and a plastic cap mounts to the top of the ... | 12/03/1991 |
