Fabric (woven – knitted – or nonwoven textile or cloth – etc.) – Nonwoven fabric
Reexamination Certificate
1999-03-31
2001-01-23
Edwards, Newton (Department: 1774)
Fabric (woven, knitted, or nonwoven textile or cloth, etc.)
Nonwoven fabric
C442S361000, C442S364000, C156S244270, C264S257000
Reexamination Certificate
active
06177369
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a batt that is compressed so that it has reduced false loft and reduced false support and is therefore more durable for consumer use.
BACKGROUND OF THE INVENTION
Vertical folding technology (VFT) batts are made by a process as described in U.S. Pat. No. 5,558,924 to Chien et al. Such batts can be used for mattresses, seat cushions or ground pads for sleeping bags, etc., where support and comfort are key required attributes. While these VFT batts provide good support and resiliency initially after being manufactured, they may have false loft and false support. Thus, a batt having what appears to be acceptable loft and support when new may lose a significant portion of its loft or support after only a short period of use. After repeated use, such batts tend to sag and to develop body impressions. These are objectionable problems which are the source of complaints and returns from customers.
Therefore, there exists a need to remove false loft and false support in a batt before it is subjected to repeated use.
SUMMARY OF THE INVENTION
The present invention reduces the problems associated with the prior art by compressing a batt before it is subjected to repeated use to remove as much false loft and false support as possible. Such a batt can be used, for example, in a mattress, a seat cushion or a ground pad for a sleeping bag.
According to the present invention, the batt is compressed so that it has an acceptable reduction in thickness and an acceptable load-at-half-height when subjected to use for an average life cycle. In particular, the batt has a thickness reduction of less than 15% and a reduction of load-at-half-height of less than 40%.
REFERENCES:
patent: 4668562 (1987-05-01), Street
patent: 5079074 (1992-01-01), Steagall et al.
patent: 5532050 (1996-07-01), Brooks
patent: 5558924 (1996-09-01), Chien et al.
patent: 5702801 (1997-12-01), Chien
patent: 296 16 418 U1 (1997-01-01), None
patent: 0 558 205 (1993-10-01), None
E. I. Du Pont de Nemours and Company
Edwards Newton
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