Like to know the patent number and the contents of the patent for C.S.
cold and hot fomentation pack, which is a product from Korea. The
clear greenish chemical gel is inside a strong thick plastic or rubber
like pack and will release stored heat when the user bent a certain
piece of metal which is inside the plastic-rubber like pack which is
with the gel . After the piece of metal is bent , the heat pack will
gradualy become 'crystal like" and  become warm and hot and can be use
as a heat pack to be applied on the surface of the part of the human
body which is painful . When the heat pack becomes cold , it can be
heated again and the "crytalized gel " will become clear gel again and
can be use again by bending the piece of special metal.
I also have seen such a product from China.
I need the patent number together with the contents of the patent .

pnri-ga

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Clarification of Question by pnri-ga on 16 Jan 2005 08:34 PST

patent to same kind of product but made from other countries other
than Korea is acceptable. I have such kind of product from Korea and
also one from china.

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Clarification of Question by pnri-ga on 16 Jan 2005 08:42 PST

I have now the patent number for your reference :
US Patent # 4,899,727
The chemical seams to be sodium acetate ( food grade and water) . Have
to find out the kind of metal which the small coin size metal is made
of .
Have to find out the content of the above US patent.
pnri-ga

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Clarification of Question by pnri-ga on 16 Jan 2005 08:49 PST

One brand of this product is called " Quantum heat packs and under the
US patent#4,899,727
Like to find out how the piece of metal can serve as the catalyst for
the reversible reaction to occur and give off the stored heat. What is
the metal made of ? Is that stated in the patent ?
 pnri-ga

Dear pnri:

According to the patent, "[t]he strip may typically consist of
phosphor bronze or beryllium copper, or other workable metal."  Claims
8 and 9 also describe the strip, which may be disc shaped, being made
of beryllium copper or phosphor bronze.

The text of the patent provides further details about the metal. 
"Generally speaking, the trigger 14 comprises a thin strip, (for
example about 0.005 inches thick) such as a metallic disc, having a
perimeter indicated at 14a in FIG. 3. Workable non-ferrous metals have
been found to include phosphor bronze and beryllium copper. Phosphor
bronze typically consists of about 80% copper, 10% tin, 9% antimony,
and 1% phosphorus. Beryllium copper is a copper alloy containing a
small amount of beryllium and typically some nickel or cobalt."

For the entire text of the patent, which provides further details
regarding the operation of the trigger and a link to the patent in
image form with drawings, go to:

"Imperforate groove trigger" Kapralis,  et al., United States Patent
4, 899, 727, United States Patent and Trademark Office (February 13,
1990) http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=4,899,727.WKU.&OS=PN/4,899,727&RS=PN/4,899,727

Sincerely,

Wonko

great answer. just what I need

pnri-ga