If a U.S. patent was re-issued in 1931, what was the original date?
920157
Probably just a few years before the reissue date, but there is no way to tell from your question.  You may be able to tell from the front of the reissue patent.  If you tell us the patent number, title, and applicant (inventor) I can look it up and give you further information.  And what do you mean by "the original date"?  Do you mean the date the patent was originally issued?\n\nThe previous two answerers are apparently under the mistaken impression that a reissue patent extends a patent term after the first patent term is ended.  This does not happen; when the patent term expires the invention passes into the public domain.  A reissue patent is generally an amended patent that a patent holder applies for when he realizes that he made a mistake writing the first version, usually because he claimed too much or not enough.  It doesn't change the patent expiration date.  Reissue patents are usually applied for within the first two years after the original patent issues.  I'm a patent attorney, by the way.
16431
3,075.  You can see the trends in a chart from 1988-2004 that compares patents filed with patents disputed.
214815
Nineteenth Amendment \nPassed by Congress June 4, 1919.  \nRatified August 18, 1920.
148138
go to the US Patent and trademark office website to find out more. html://www.USPTO.gov
727894
invented by Thomas Edison in 1879\n\nheres 833,000 sources
329768
January 11th, 2006\ni just googled it
937586
Ernst Strickler at Mettler Instrumente AG in Checoslavakia.  US Patent No. 4,136,750, January 30, 1979.
237460
May 10, 1954\n\nhttp://www.britannica.com/eb/article-9343590?tocId=9343590
861735
It actually depends on where in the world you are. If you're in the U.S. or anywhere in North America, that date would be February 10th, 2007. But if you're in England or India or at MOST English colonies (places that were once ruled by England), it would be October 2nd, 2007.\n\nThey should really pick one to be standard in order to prevent confusion.
902958
excellent.i have been wondering this for years(serously)If i ever prove this plz dont compete with me for patent.i think we can share the reward.
678318
U.S. currency features something known as "series dates." A series date does not indicate the year a particular bill was printed, but rather the date of the design featured on that bill. That is, if the $5 bill were redesigned in 1929, all subsequent $5 bills issued using that design would be marked "Series 1929," regardless of when they were actually printed. (When a minor change is made to a bill's features — such as a substitution of signatures due to the appointment of a new Treasurer of the United States or Secretary of the Treasury — the series year remains the same, but a letter is appended to it. Thus a minor change to "Series 1929" currency would result in bills marked "Series 1929A.") \n\nSmall wonder, then, that some people assumed the 2006 release of newly-redesigned $10 bills bearing a legend reading "Series 2004" was the product of some sort of printing error. \n\nThe series date isn't an error, though. Although the most recent re-designs of the $10, $20, and $50 bills were authorized for 2004, the release of the denominations incorporating these new designs was (as in the previous wave of currency re-designs in 1996-2000) staggered across several years. Thus, although all three denominations bearing the latest designs are technically "Series 2004" bills, the newest $20 bills were first put into circulation at the end of 2003, the new $50 bill was first released at the end of 2004, and the new $10 bill wasn't issued until March 2006. Confusing, perhaps, but not a mistake as far as the U.S. Bureau of Engraving and Printing is concerned.
170719
http://inventors.about.com/library/weekly/aa020600h.htm
308318
September 25, 1980.\n\nCheck out this link:\nhttp://en.wikipedia.org/wiki/T.I.
1041278
what date is the copyright?
530181
No, It was December 7th in 1941 not 1940!
62768
I posted the direct link to the USPTO's search engine below.\n\nThe USPTO site can be confusing at times, so I wanted to provide you with instructions to get exactly what you're looking for.\n\nTo search for the given object itself, type in the name of the object (e.g. "plant holder" -- putting it in quotation will pop up the exact phrase you're looking for) and change the field to TITLE. For owners, enter the name (e.g. "Microsoft) and change the field to INVENTOR NAME or ASSIGNEE NAME. Try both because oftentimes the inventor & the owner are not one & the same.\n\nPlease be aware this method only works for patents from 1976-present. If looking for patent information from 1790-1975, you will need the Patent Number.\n\nHope that helps!
703562
Yes, you certainly can use dates just like that!  In fact you should, as it is much clearer to say 1940 than it would be to say "the year nineteen hundred and forty".\n\n~ ♥ ~