Post-it Note
A Post-it Note (or sticky note) is a small piece of paper with a re-adherable strip of glue on its back, made for temporarily attaching notes to documents and other surfaces. A low-tack pressure-sensitive adhesive allows the notes to be easily attached, removed and even re-posted elsewhere without leaving residue. Originally small yellow squares, Post-it Notes and related products are available in various colors, shapes, sizes and adhesive strengths. As of 2019, there are at least 26 documented colors of Post-it Notes. Although 3M's patent expired in 1997 , "Post-it" and the original notes' distinctive yellow color remain registered company trademarks, with terms such as "repositionable notes" used for similar offerings manufactured by competitors. While use of the trademark 'Post-it' in a representative sense refers to any sticky note, no legal authority has ever held the trademark to be generic. History. In 1968, Dr. Spencer Silver, a scientist at 3M in the United States, attempted to develop a super-strong adhesive. Instead, he accidentally created a "low-tack", reusable, pressure-sensitive adhesive. For five years, Silver promoted his "solution without a problem" within 3M both  informally and through seminars, but failed to gain adherents. In 1974, a colleague who had attended one of his seminars, Art Fry, came up with the idea of using the adhesive to anchor his bookmark in his hymn book. Fry then utilized 3M's sanctioned "permitted bootlegging" policy to develop the idea. The original notes' pale yellow color was chosen by chance, from the color of the scrap paper used by the lab next door to the Post-It team. 3M test marketed the product as "Press 'n Peel" bookmark in stores in four cities in 1977, but  results were disappointing. A year later, 3M gave free samples to consumers in Boise, Idaho, with 94 percent of those who tried them indicating they would buy the product. The product was sold as "Post-Its" at its 1979 introduction, and was rolled out across the United States from April 6, 1980. The following year, they were launched in Canada and Europe. In 2003, the company introduced "Post-it Brand Super Sticky Notes", with a stronger glue that adheres better to vertical and non-smooth surfaces. Until 3M's patent expired in the 1990s, Post-it type notes  were produced only in the company's plant in Cynthiana, Kentucky. In 2018, 3M launched "Post-It Extreme Notes", which are more durable and water-resistant and which stick to wood and other materials in industrial environments. Competing claims. Alan Amron claimed to have been the actual inventor in 1973 who disclosed the Post-it Note technology to 3M in 1974. His 1997 suit against 3M was settled with a payment from 3M to Amron. As part of the settlement, Amron agreed not to make future claims against the company unless the settlement agreement should be  breached. However, in 2016, he launched a further suit against 3M, asserting that 3M was wrongly claiming to be the inventor, and seeking $400 million in damages. At a preliminary hearing, a federal judge ordered the parties to undergo mediation. The suit was subsequently dismissed, upholding the previous 1998 settlement. In July 2016 a former 3M marketing department employee, Daniel Dassow, admitted that in 1974 Alan Amron had disclosed his Press-on memo sticky notes invention to 3M. In art. "The Yellow Stickee Diary of a Mad Secretary", by Rosa Maria Arenas, is the mini graphic  journal of an office worker/artist, exhibited July 7 through August 25, 2013, at the Michigan Institute of Contemporary Art (MICA) Gallery in Lansing, Michigan. The 41 drawings displayed are a tiny percentage of the more than 2000 original drawings that constitute the Yellow Stickee Diary Project which Arenas created while working temp jobs from 1994 to 2005. Printed with archival inks on archival paper, the reproductions include "stickee sized" (3″ × 5″) framed prints and enlargements of the original drawings (which were all done on Post-It Notes). In 2012, Turkish artist Ardan Özmenoğlu was selected to have a  solo exhibition at Bertrand Delacroix Gallery in the art district of Chelsea, Manhattan. The exhibition, titled "E Pluribus Unum" (Latin for "Out of many, one"), opened November 15, 2012 and featured large scale works on Post-It Notes. In 2004, Paola Antonelli, a curator of architecture and design, included Post-it Notes in a show entitled "Humble Masterpieces". Rebecca Murtaugh, a California artist, who uses Post-it Notes in her artwork, in 2001 created an installation by covering her whole bedroom with $1000 worth of the notes, using the ordinary yellow for objects she saw as having less value  and neon colors for more important objects, such as the bed. In 2000, the 20th anniversary of Post-it Notes was celebrated by having artists create artworks on the notes. One such work, by the artist R. B. Kitaj, sold for £640 in an auction, making it the most valuable Post-It Note on record. The Lennon Wall, a message board created during the 2014 Hong Kong protests from a stretch of curved staircase in the Central Government Complex, is covered in multi-colored Post-It Notes with handwritten messages from supporters. Satiregram, a parody account on Instagram by  Euzcil Castaneto, showcases handwritten messages on Post-it Notes that describe typical pictures people would post on Instagram. Software implementations. Virtual Post-It Notes have been created for computers in the form of desktop notes. These include 3M's own Post-it Brand Software Notes, Stickies in macOS, Sticky Notes in Windows, or other applications like ShixxNOTE. Virtual Post-It–like notes are also available online using Evernote, Google Keep, or Microsoft OneNote. In 1997, 3M sued Microsoft for trademark infringement for using the term "Post-It" in a help file.