Plant protecting and regulating compositions – Plant growth regulating compositions – Designated nonactive ingredient containing
Reexamination Certificate
1998-12-21
2001-02-20
Clardy, S. Mark (Department: 1616)
Plant protecting and regulating compositions
Plant growth regulating compositions
Designated nonactive ingredient containing
C428S378000, C428S396000
Reexamination Certificate
active
06191072
ABSTRACT:
BACKGROUND—FIELD OF THE INVENTION
This invention relates to rotating-flexible-line trimmers specifically to a cutting line that simultaneously applies herbicide as vegetation is cut.
BACKGROUND—DESCRIPTION OF PRIOR ART
Rotating line trimmers have gained widespread popularity for trimming vegetation in hard-to-reach places such as next to buildings, fences, trees, and shrubs. Such trimmers typically include a rotating hub from which a cutting line is radially dispensed. Preferably, the line is flexible to increase the safety of the trimmer. As the hub is rotated, the resulting centrifugal force causes the line to extend substantially straight out from the hub. The line, being rotated at high speeds serves as a cutting surface similar to a blade. Applications can be divided into two basic categories:
(1) removal of unwanted vegetation and
(2) trimming of desired vegetation.
The present invention addresses the first category, removal of unwanted vegetation. Examples include weeds in walkways, driveways, between pavers, and on other paved surfaces. In these situations complete and permanent removal is desired. For this reason, unwanted vegetation is trimmed as close to the root as possible. Nevertheless, weed roots remain intact and regrowth may occur.
Currently, the options for clearing unwanted vegetation are limited. Vegetation may be sprayed with herbicide; however, the kill process may take considerable time, from days to weeks. After vegetation has expired, dead vegetation must be removed. A further disadvantage of herbicide spraying is that overspray and dripping may cause unnecessary environmental impact.
The line trimmer provides a second option, severing unwanted vegetation from the root. The advantage of this approach is that cut vegetation can be removed immediately by sweeping with a push brush or a broom. The disadvantage is that vegetation roots remain intact and may regrow. Consequently, the trimming job must be repeated frequently due to vegetation regrowth.
As such, there is need for a device that simultaneously trims vegetation and applies herbicide.
OBJECTS AND ADVANTAGES
Accordingly, several objects and advantages of my invention are:
(a) to provide a cutting line that simultaneously applies herbicide as vegetation is trimmed;
(b) to provide an alternative to herbicide spraying that reduces herbicide usage thereby limiting environmental impact;
(c) to provide an alternative to herbicide spraying that severs vegetation from the root thereby permitting immediate removal;
(d) to provide a cutting line that keeps driveways, walkways, and patios weed-free for extended periods of time; and
(e) to provide a new herbicide product that appeals to a wide range of consumers including homeowners with casual gardening interests.
REFERENCES:
patent: 3864114 (1975-02-01), Green
patent: 3994437 (1976-11-01), Kitterman
patent: 4405360 (1983-09-01), Cardarelli
patent: 5665822 (1997-09-01), Bitler et al.
Clardy S. Mark
Hamilton Brook Smith & Reynolds P.C.
Johnson Rodney D.
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