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What is the structure of a combination claim?

What is the structure of a combination claim?
« on: December 13, 2016, 06:17:19 AM »

I have been trying to understand what is the structure of a combination claim. The only information I found in internet is the following:
Combination claim. The preamble of this form of claim is considered to positively and clearly include all the elements or steps recited therein as a part of the claimed combination.

I appreciate if someone could provide me with information "in easy to understand form"

Thank you in advance!

Brad

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Re: What is the structure of a combination claim?
« Reply #2 on: December 13, 2016, 10:47:15 AM »
brad, thanks for your reply.

combination claim is mentioned in
"patent it yourself" book, 18th edition,
pdf book p.251.

Combination claim is mentioned,
but I can't find any explanation

Brad

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Re: What is the structure of a combination claim?
« Reply #3 on: December 14, 2016, 01:05:40 PM »
It shows me an example of that part of the book which talks about combination claims.  According to the author the combination claim is a claim that recites both old and new items together.    An example may be if you were the first person to invent a pencil with an eraser on top and other people have already invented a regular pencil your combination claim would be:

1.  A writing instrument, the instrument comprising:
(a) an elongate shaft having a lower end and an upper end;
(b) a writing tip integrated into said lower end of the shaft; and
(c) an eraser coupled to said upper end of the shaft.

In this claim parts (a) and (b) are already known and part (c) is new making it a "combination claim". 
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