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The good news is that the provisional patent application should focus on the technical information.  The main job of the provisional is to serve as proper "support" for later filed applications so it is important you have good technical information included.

In order to answer your question, you need to first determine what is the most innovative and important components for your system.   Then pretend you had a patent that covered those components and their arrangement and see how someone else could try to get around your patent by changing the design.   Make sure your figures and text that you include in the PPA do a good job of showing your primary system plus the next best alternative.   

No need to waste time on explaining common features that are well known. 
Thank you Brad for the fast quick and educational response. My original question was truncated but you answered my question fully anyway. Here is the full text in case anyone is interested.
This is the first provisional patent application (PPA) I've attempted. With an engineering background, I tend to approach tasks from the technical side, so please forgive my lack of basic patent skills. I
Invention Prototyping and Development / Re: A new kind of wind power generator
« Last post by RevI on December 05, 2023, 10:00:04 PM »
You can sell or license a pending patent application after it has been filed.  Good luck.
Thanks for your reply. And, regarding the first part, can you tell me how close the real prototype would perform in comparison to the simulation. Even half will be enough. And, is there anyone here who can help me to license or sell this technology to any prospective investor.
Invention Prototyping and Development / Re: A new kind of wind power generator
« Last post by Brad on December 03, 2023, 02:04:59 PM »
You can sell or license a pending patent application after it has been filed.  Good luck.
Invention Prototyping and Development / A new kind of wind power generator
« Last post by RevI on December 02, 2023, 08:01:24 AM »
I am an Indian inventor. For a long time, I am continuing personal research about a new kind of wind power generation system. Recently, while searching net, I have found out that the necessary machinery is already available in market. In short, the machine now can be built easily.
At present, I have completed the CAD drawing and done some ANSYS simulation testing. As per the latest simulation where the RPM was set of 3600, the torque was found to be around 1.52 for a machine of 35 cm diameter and the input wind velocity was set to be 6 m/s. For me, this is promising result and I can say that no wind turbine in anywhere around the world of that little diameter can generate such torque at this RPM.
I now want to further develop this invention by making a real prototype. And, I want to know, how close the real prototype can perform in comparison to the simulation. And, I have already applied for a patent, kindly tell me whether I can approach any possible investor or buyer to sell/license the technology or not.
Patent Questions and Advice / Re: query about
« Last post by Brad on November 01, 2023, 08:46:35 AM »
Based on your example I would file it as one application.  Normally things like choice of material or manufacturing process are not that important when you are trying to claim a new device like a pencil case.   
Patent Questions and Advice / query about
« Last post by Deemak on November 01, 2023, 05:44:57 AM »
Hi everyone. I was after some guidance around this: if my invention has 2 designs- each with the same purpose, but each with slight variation in functionality and both with different manufacturing processes ( as version 1 is made of plastic, the 2nd is made of metal), does this need to be submitted as 2 different provisional patent applications or can it be done under 1 with an explanation of both versions of the product?

eg) if i have invented 2 designs of pencil cases that holds 5 pencils ,case a + case b:

case a) is made of plastic with plastic clips to grip the pencils
case b) is made of metal and has elastic straps for the pencils to be inserted

In this case do 2 separate PPA's need to be filed for each design, or can it all be done under 1?

Any advice on this would be much appreciated.
You cannot add new material to any patent application after it has been filed so you cannot update it.  You should file a new application.  We sometimes have 2-5 PPAs that we later merge together into a full non-provisional utility application. 

If you did not pay the fee you will get a letter from the patent office telling you how to make payment.  However, in this case it would be safest and easiest for you to file your application again as a new PPA and make sure you pay the fee online this new version. 
Patent Questions and Advice / updating PPAs (provisional patent applications)
« Last post by ppa on May 30, 2023, 12:16:20 AM »
is it possible to update PPAs and how to do it, or does one need to refile for every update?

Also, how long do I have to pay for a PPA if I do not do it online immediately when filing PPA? How is the payment done the easiest outside of USA?
Patent Questions and Advice / Re: Does including a patent as a reference imply protection?
« Last post by Brad on February 04, 2023, 01:12:38 PM »
Unfortuently you cannot get that from the patent office.  If your patent cites old_patent_123 and then your patent is allowed that just means that the patent examiner thought your idea was different enough from old_patent_123 that it could be its own invention.  It does not mean that you are clear and not infringing on old_patent_123.

Another simple example would be a bicycle.  If old_patent_123 claimed a bicycle with two wheels and you made a bicycle with three wheels you may get your own new patent approved because it was different than old_patent_123 with two wheels.  However, your three wheel bicycle also includes two wheels plus a third wheel so the owner of old_patent_123 may enforce their patent against you because your bicycle has two wheels.  the fact that you have three wheels does not matter because your three wheel bicycle also has two wheels (2+1=3). 

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