Stock material or miscellaneous articles – Layer or component removable to expose adhesive – Release layer
Reexamination Certificate
1998-10-08
2001-06-19
Ahmad, Nasser (Department: 1772)
Stock material or miscellaneous articles
Layer or component removable to expose adhesive
Release layer
C024S06700R, C024S0670AR, C281S021100, C412S037000, C412S038000, C412S901000, C428S040100, C428S040200, C428S042100, C428S194000, C428S211100, C428S214000, C428S354000
Reexamination Certificate
active
06248414
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a unitary stack of paper sheets. More particularly, the invention relates to a unitary stack of paper sheets whereby each individual paper sheet is readily removed from the stack and used for item posting purposes.
BACKGROUND OF THE INVENTION
Many people are in the habit of posting notes, appointment cards, children's artwork, messages, grocery lists, emergency telephone numbers, invitations and other informational-type items in a central home or office location. Bulletin boards, of course, have long been used for posting items. Thumb tacks or some needle-like tipped implement is used to hold the items, normally printed paper items, to the bulletin board. The homeowner may use a refrigerator door or other appliance with a large metallic surface area for temporarily holding the items. Thin magnets, commonly referred to as refrigerator magnets, are widely used. Adhesive tape can also be used to tape edges or corners of the item to the substrate. A double sided tape is also occasionally used. Such means of posting an item for later referencing are convenient, though can be somewhat cumbersome to use.
A substantial number of homes do not have a bulletin board for posting purposes or a kitchen appliance with a metallic substrate. In fact, many modern appliances have non-metallic surface panels which do not interact with magnets. Posting of light-weight items is more difficult in such homes. Articles produced to fill the known need include mark and wipe boards and dry erase boards.
In accord with a need, there has been developed a unitary stack of paper sheets, each sheet of which can be used to form a base for adhering an item thereto. The unitary stack is economical to produce, its use is easily understood, and the individual paper sheets are reliable for their intended purpose.
SUMMARY OF THE INVENTION
A unitary stack of paper sheets has sheets loosely bonded together in a manner whereby the stack maintains its integrity during storage and use, yet permits each individual paper sheet in the stack to be readily removed. The stack comprises alternating paper sheets and release liners. Each paper sheet has a front face and a back face. A pressure sensitive acrylic adhesive partially covers each face of each individual sheet in approximate aligned areas thereof. The acrylic adhesive is in the form of microspheres with an about 0.4 mils to about 0.8 mils thickness to obtain the proper adhesive strength for the intended purposes. The pressure sensitive adhesive on the back face of the paper sheet allows the paper sheet to be adhered to a substrate. The pressure sensitive adhesive on the front face of the paper sheet is to receive and hold an item for posting. The release liners facilitate removal of the individual paper sheets from the unitary stack.
REFERENCES:
patent: 5202169 (1993-04-01), Spendlove
patent: 5766401 (1998-06-01), Campbell et al.
patent: 5965225 (1999-10-01), Torres
Ahmad Nasser
P. R. Donahue Incorporated
Wilson Charles R.
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