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Dunhill: Difference between revisions
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File:Patentfile2.png|US Patent Office | File:Patentfile2.png|US Patent Office | ||
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The American patent application was prepared and filed before the English concession, between September 19 and October 14, 1918. The American patent was granted more than a year later, on May 25, 1920. Canadian documents were behind the U.S. in a year, with application of 1919 and the numerical code system for date marking only started at 1922, but occasionally we found pipes that can be dated before 1922, specifically, those that were Stamped by: "DUNHILL'S SHELL" - "MADE IN ENGLAND", followed by "PAT. MAR. 9.15" with "PAT. APP FOR" and "AT. 1914" with "PAT. APP FOR". The patent references are respectively for the U.S. and Canada. These impressions possibly date from the patent application, not the concession. Hard to say with certainty, but it is speculated that the first was commercialized in mid-1917 while the process was proceeding. The tests were run and improved since 1914 with the support of a company specializing in glass blasting, the London Sandblasting Company. | |||
[[File:Shellloringpat.jpg|thumb|right| Patent Example © J. Loring.]] | |||
Jonathan Guss and Jesse Silver, important members of our community, point out inconsistencies in the main story that is widespread, in which it states that the blasting in pipes is authored by Dunhill. The blasting technique was invented in 1870 and patented by Benjamin Chew Tilghman, 47 years before Dunhill used it in his pipes. There is no way to say for sure who was the first who applied the concept in pipes. There are clues and theories that point to sandblasting performed in pipes before Dunhill, by [[Barling]], for example, in a model called "Niblick" in mid-1917. Guss points out that the patent is more related to the process than the thing itself, the blasting. Alfred's invention therefore concerns the treatment and healing of the Briar in oils, strengthening it as it removes impurities. Alfred Dunhill explained the process of curing oil and sandblasting in his patent application. | |||
[[Image:DunhillI.jpg|thumb|right|A 1937 Shell LB, G.L. Pease collection[http://pipedia.org/index.php?title=The_Mystery_of_the_White_Spot_-_Pipes_from_Dunhill]]] | [[Image:DunhillI.jpg|thumb|right|A 1937 Shell LB, G.L. Pease collection[http://pipedia.org/index.php?title=The_Mystery_of_the_White_Spot_-_Pipes_from_Dunhill]]] | ||