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The first patent for the O-ring is dated May 12, 1896, as a Swedish patent. J. O. Lundberg, the inventor of the O-ring, received the patent. [6] The US patent [7] [8] for the O-ring was filed in 1937 by a then 72-year-old Danish-born machinist, Niels Christensen. [9]
BDORT as illustrated in patent 5188107 [1]. The Bi-Digital O-Ring Test (BDORT), characterized as a form of applied kinesiology, [2] is a patented alternative medicine diagnostic procedure in which a patient forms an 'O' with his or her fingers, and the diagnostician subjectively evaluates the patient's health according to the patient's finger strength as the diagnostician tries to pry them apart.
His first design included a lever that pierced a hole in the top of the can, but this caused a safety hazard as it produced sharp edges that could cut the user's finger. Later that year, he established a mechanism known as the " pull-tab " can, with its users simply being required to pull a removable tab to open the drink.
A heterocyclic compound or ring structure is a cyclic compound that has atoms of at least two different elements as members of its ring(s). [1] Heterocyclic organic chemistry is the branch of organic chemistry dealing with the synthesis, properties, and applications of organic heterocycles .
The first Patent Act of the U.S. Congress was passed on April 10, 1790, titled "An Act to promote the progress of useful Arts." [20] The first patent was granted on July 31, 1790 to Samuel Hopkins for a method of producing potash (potassium carbonate). The earliest law required that a working model of each invention be submitted with the ...
Thus the seal is created. O-rings decidedly do not act in any way like this. They use the pressure of the fluid to slightly push themselves into the crevice on the other side of the groove. In short, a gasket simply improves the seal between two surfaces while an O-ring is a seal in itself.128.6.73.200 16:35, 31 July 2009 (UTC)