Quote from: LarryC on August 18, 2012, 08:36:38 AM
Component comparison of pneumatic cylinder to Travis pneumatic risers in first picture.

Regards, Larry

Larry,
I stopped for a minute to rest/and/check progress on the forum.
I have to say- you are doing an excellent job giving visual representations.
The water surface is our hydro/pneumatic seal for our Z.E.D - a little less friction is not a bad thing 
Thank you,
Wayne

Quote from: see3d on August 18, 2012, 08:40:10 AM
Very good Johnny,

You are on the right track.  By trial and error last night I found a factor I could use to make the internal PSI check consistent.  It was Factor = H2Area / H1Area.  Unfortunately, that violates my first assumption that the PSI must counter the input force: Air PSI = InputForce / H0Area.  So, I must reject the answer of  PSI = InputForce / ( H0Area * Factor ).  However, with the clue that it is off by that ratio, I will look to the formula further down stream that uses that same ratio in finding H1 and H2.

Thanks for the suggestion.

   your welcome 

And now for something completely different...

Thanks, MrWayne. I am learning a lot from you. The big reservoir was not obvious to me... I guess it would have bit me if it was a snake or something. Thanks for pointing it out. The little filter that I at first thought you were talking about didn't look nearly big enough.

Using the search terms you gave me, I found this application:

United States Patent Application 20120117957
http://www.freepatentsonline.com/y2012/0117957.html

All I can find is this application. Can you please give me a link to the actual granted patent at the USPTO?


Here is some more information I found to be very interesting, lots of stuff I didn't know about patents, the PCT system, and patent applications.

http://www.patentlens.net/daisy/patentlens/3037.html
http://en.wikipedia.org/wiki/Patent_application
http://www.legalzoom.com/utility-patents-faq/what-difference-provisional-utility-patent.html
http://en.wikipedia.org/wiki/Patent

From the last reference:

QuoteA patent is requested by filing a written application at the relevant patent office. The person or company filing the application is referred to as "the applicant". The applicant may be the inventor or its assignee. The application contains a description of how to make and use the invention that must provide sufficient detail for a person skilled in the art (i.e., the relevant area of technology) to make and use the invention. In some countries there are requirements for providing specific information such as the usefulness of the invention, the best mode of performing the invention known to the inventor, or the technical problem or problems solved by the invention. Drawings illustrating the invention may also be provided.
The application also includes one or more claims, although it is not always a requirement to submit these when first filing the application. The claims set out what the applicant is seeking to protect in that they define what the patent owner has a right to exclude others from making, using, or selling, as the case may be. In other words, the claims define what a patent covers or the "scope of protection".
After filing, an application is often referred to as "patent pending". While this term does not confer legal protection, and a patent cannot be enforced until granted, it serves to provide warning to potential infringers that if the patent is issued, they may be liable for damages.^[23][24][25]
For a patent to be granted, that is to take legal effect in a particular country, the patent application must meet the patentability requirements of that country. Most patent offices examine the application for compliance with these requirements. If the application does not comply, objections are communicated to the applicant or their patent agent or attorney and one or more opportunities to respond to the objections to bring the application into compliance are usually provided.
Once granted the patent is subject in most countries to renewal fees to keep the patent in force. These fees are generally payable on a yearly basis, although the US is a notable exception. Some countries or regional patent offices (e.g. the European Patent Office) also require annual renewal fees to be paid for a patent application before it is granted.

Again, I want to thank you for being so forthcoming in your explanations to me. Sometimes I don't "get it" what people are telling me the first time, so I usually try to do a little research of my own, and I always learn a lot when I do.

EDIT: I also found this, that may be of some passing interest.
http://en.wikipedia.org/wiki/Patent_pending

QuoteThe marking of an article as patented when it is not in fact patented is against the law and subjects the offender to a penalty. Some persons mark articles sold with the terms "Patent Applied For" or "Patent Pending". These phrases have no legal effect, but only give information that an application for patent has been filed in the Patent and Trademark Office. The protection afforded by a patent does not start until the actual grant of the patent. False use of these phrases or their equivalent is prohibited". ^[5]

@derricka: Thanks, I got it...
The HP8640B is fully operational now, thanks for asking.
Do you know anyone that needs one? I'll sell this one cheap, I just do not have room for it.