Patent US4195307A successfully refreshed from Google Patents.
US4186239A
Expired / Lapsed
US
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Monofilament weed cutters
Assignee: Berkley and Co Inc
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Filing: 1978-02-07
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Granted: 1980-01-29
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Expires: 1998-02-07
Abstract
Abstract An improved filament for use in the cutting of weeds and vegetation, wherein the filament is attached at one end to a hub for imparting rotary motion to the filament. The centrifugal force extends the filament radially outwardly from the hub, with the energy of rotation being utilized to sever or cut the vegetation. The filament has a generally centrally disposed axis with an irregular or variant cross-section which fluctuates along the axial length of the filament. The variant cross-section with its fluctuations in cross-sectional area reduce the end or terminal fibrillation of the filament.
Inventors
- 👤 Charles J. Mize
- 👤 James T. Rumbaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:16
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/416; A01D34/4168; D; D02; D02G; D02G3/00; D02G3/22; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2976; Y10T428/2978
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
73 words
A weed cutting filament attachable at one end to a rotatable hub, for impact severing of vegetation, the filament comprising: (a) an elongated filamentary member having a generally centrally disposed axis and a predetermined substantially constant cross-sectional dimension with indentations formed at spaced intervals along the length thereof, said indentations being formed at spaced apart arcuate and axial dispositions, said indentations being axially spaced by a distance of at least about 0.003 inch.
Claim 2
Dependent Claim
73 words
A weed cutting filament attachable at one end to a rotatable hub, for impact severing of vegetation, the filament comprising: (a) an elongated filamentary member having a generally centrally disposed axis and a predetermined substantially constant cross-sectional dimension with indentations formed at spaced intervals along the length thereof, said indentations being formed at spaced apart arcuate and axial dispositions, said indentations being axially spaced by a distance of at least about 0.003 inch.
Claim 3
Dependent Claim
33 words
The filamentary vegetation cutter as defined in claim 1 being particularly characterized in that said filament is fabricated from a polyamide nylon selected from the group consisting of nylon 6 and nylon 6/11.
Claim 4
Dependent Claim
27 words
The filamentary vegetation cutter as defined in claim 1 being particularly characterized in that the ratio of length to major cross-sectional dimension is at least about 7:1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-28 | 1983-07-30 | 1984-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-28 | 1987-07-30 | 1988-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-28 | 1991-07-30 | 1992-01-29 | $7700.00 | Window Closed / Lapsed |