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Dating Guide Addendum: Difference between revisions
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'''About Inner Tube w/ Flange registred in Canada.''' | '''About Inner Tube w/ Flange registred in Canada.''' | ||
Loring pointed out in his studies that this patent was used between 1927 and 1941. However, that patent was granted on February 17, 1920, and expired on February 17, 1937. He does not make clear the reason for this possible six-year period without using this patent or because it would be used after the registration had expired. | |||
A plausible possibility is that this postponement occurred because of the validity of patent 158709, another Canadian patent for Inner Tube (without flange), which expired in 1926. Although, we can observe the concurrent use of British patents 5861/12 (for Inner Tube) and 116989/17 (Inner Tube w/ Flange) between 1918 and 1926. As we can see, one thing does not exclude the other. | |||
I believe that this patent was used throughout its term and that it was also not used after the concession period - i.e, it was used between 1920 and 1937 on pipes directed to Canada. | |||
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13:17, 6 July 2020 (CDT) | 13:17, 6 July 2020 (CDT) | ||