US4422465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nail file and method for producing the same
Assignee: SHIDEIDO Co Ltd A CORP OF JAPAN
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Filing: 1980-10-17
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Granted: 1983-12-27
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Expires: 2000-10-17
Abstract
Abstract A nail file having an excellent and uniform filing property and a method for greatly facilitating the manufacture of same are provided. This nail file has a number of file blade formed by a number of edge lines of concave portions randomly or irregularly etched in the surface of a flat metal plate. These concave portions have a diameter of 100 through 300 microns, a depth of 10 through 80 microns and a distance between the adjacent edge lines of 10 through 100 microns. The concave portions are photographically etched in the surface of a flat metal plate by using a photosensitive resin.
Inventors
- 👤 Tomoyuki Haga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:14
CPC Classifications
A; A45; A45D; A45D29/00; A45D29/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
103 words
A nail file having a number of file blades formed by a number of edge lines or concave portions, which are etched in the surface of flat metal plate, the arrangement of said concave portions being random or irregular, the diameter a of said concave portions being within the range of 100 to 300 microns, the depth b of said concave portions being within the range of 10 to 60 microns, the distance c between the adjacent edge lines of said concave portions being within the range of 10 to 60 microns and the angle θ of the blades being less than 90°.
Claim 2
Dependent Claim
103 words
A nail file having a number of file blades formed by a number of edge lines or concave portions, which are etched in the surface of flat metal plate, the arrangement of said concave portions being random or irregular, the diameter a of said concave portions being within the range of 100 to 300 microns, the depth b of said concave portions being within the range of 10 to 60 microns, the distance c between the adjacent edge lines of said concave portions being within the range of 10 to 60 microns and the angle θ of the blades being less than 90°.
Claim 3
Dependent Claim
18 words
A nail file as claimed in claim 1, wherein said flat metal plate is a flat stainless steel.
References Cited (Backward Citations)
US852873A
Cited
US1418974A
Cited
US2087484A
Cited
US3543362A
Cited
US4091516A
Cited
US4240806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |