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...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.

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Class 222/248 - Unitary


Subclass of Class 222 - Dispensing
Definition: Dispensers in which the serial means are rigidly connected
No. of patents: 1
Last issue date: 08/30/1994


NumberTitleIssue Date
5341962Swing arm feeder
A feeder for discharging a load of material includes a hopper, a swing arm pivoting between raised and lowered positions in the hopper, and a ram mounted on the free end of the swing arm. The ram is moved by the swing arm back and forth on a curved floor ...
08/30/1994
 
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