|Re: Is RPN a pattern of HP?|
Message #17 Posted by Egan Ford on 7 Aug 2006, 6:38 p.m.,
in response to message #1 by Timespace
I have OCR'd a few manuals and searched for RPN and RPL. No trademark or patent statements exist. That does not mean that there are none, but usually you would expect them to be in the manuals. My search did yield the following from the a 42S manual:
Is RPN a pattern of HP? If another company starts making and selling calculators with RPN mode of operation without algebraic, does it have to pay HP fees?
"HP's operating logic is based on a mathematical logic known as 'Polish Notation,' developed
by the Polish logician Jan Lukasiewicz (1878-1956). ..."
That said RPN would be prior art, and it should not be allowed to have a US patent. However, lawyers can be crafty and get anything patented (Google for the Australian that tried to patent "the wheel"). However, *how* something is implemented is patentable.
Even if RPN was patented, US patents expire after 20 year unless you can find a new use for your invention.
Trademarks are a different matter. Disney has succeeded in extending the trademark for Mickey Mouse. I am no lawyer, but I believe that trademarks can be implied.
My $0.02US, you can make an RPN that works like an HP, but you may be unable to label it "RPN SCIENTIFIC". And if you are in the right and HP in the wrong, it can cost you. (Ever seen the 12L ('L'awyer), most of the keys end in '$' and are exponential functions).
Edited: 7 Aug 2006, 7:31 p.m. after one or more responses were posted