# US 10,478,983 B2 · Snap-off double-edged razor blade

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- Number: US 10,478,983 B2
- Document ID: US10478983B2
- Status: Granted
- Kind: B2
- Application number: 15/918,676
- Filed: 2018-03-12
- Published: 2018-07-19
- Granted: 2019-11-19
- Earliest claimed: 2015-09-15
- Assignees: Dorco Co., Ltd.
- Applicants: Dorco Co,. Ltd.
- Inventors: Hee Sung Yang; Jae Young Lee; Hyun Ju Lee
- Web page: https://patentgrep.com/patent/US10478983B2

## CPC

- B26B 21/56: characterised by the shape
- B26B 21/10: Safety razors with one or more blades arranged longitudinally to the handle
- B26B 21/4012: {Housing details, e.g. for cartridges}
- B26B: HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR (for harvesting A01D; for horticulture, for forestry A01G; for butchering or meat treatment A22; for manufactering or repairing footwear A43D; nail clippers or cutters A45D29/02; kitchen equipment A47J; {vegetable slicers, julienne cutters and similar devices and holders therefor, B26D3/28}; for surgical purposes A61B; for metal B23D; cutting by abrasive fluid jets B24C5/02; plier-like tools with cutting edges B25B7/22; pincers B25C11/02; handles for hand implements, in general B25G; guillotine-type cutters B26D; {perforating by non-mechanical means, e.g. by fluid jet, B26F1/26}; for erasing B43L19/00; for textile materials D06H)

## Abstract

A double-edged razor blade including: a first unit blade having a first cutting edge; a second unit blade having a second cutting edge; a first connecting portion connecting one side of the first unit blade with one side of the second unit blade; a second connecting portion connecting the other side of the first unit blade with the other side of the second unit blade; a pair of first notches forming a boundary between the first unit blade and the first and the second connecting portions, and guiding breakage of the first unit blade; and a pair of second notches forming a boundary between the second unit blade and the first and the second connecting portions, guiding breakage of the second unit blade.

## Claims

### Claim 1

A double-edged razor blade, comprising:
a first unit blade having a first cutting edge;
a second unit blade having a second cutting edge;
a first connecting portion connecting one side of the first unit blade with one side of the second unit blade;
a second connecting portion connecting the other side of the first unit blade with the other side of the second unit blade;
a pair of first notches forming a boundary between the first unit blade and the first and the second connecting portions, and guiding breakage of the first unit blade, wherein a direction along which each notch of the pair of first notches extends forms an acute angle with a direction along which the first cutting edge extends; and
a pair of second notches forming a boundary between the second unit blade and the first and the second connecting portions, guiding breakage of the second unit blade, wherein a direction along which each notch of the pair of second notches extends forms an acute angle with a direction along which the second cutting edge extends.

### Claim 2 (depends on 1)

The double-edged razor blade of claim 1, wherein the acute angle formed by each notch of the pair of first notches with the first cutting edge ranges from 60 to 80 degrees, and the acute angle formed by each notch of the pair of second notches with the second cutting edge ranges from 60 to 80 degrees.

### Claim 3 (depends on 1)

The double-edged razor blade of claim 1, wherein the first unit blade comprises first concave portions formed to be in contact with both ends of each of the first notches, and the second unit blade comprises second concave portions formed to be in contact with both ends of each of the second notches.

### Claim 4 (depends on 1)

The double-edged razor blade of claim 1, wherein at least one of the first pair of notches and the second pair of notches comprise a groove having a V-shaped cross-section.

### Claim 5 (depends on 1)

The double-edged razor blade of claim 1, further comprising: a pair of third notches formed to traverse the first connecting portion and the second connecting portion to guide breakage of the first connecting portion and the second connecting portion.

### Claim 6 (depends on 5)

The double-edged razor blade of claim 5, wherein the first unit blade and the second unit blade are substantially symmetric to each other with respect to the pair of third notches.

### Claim 7 (depends on 5)

The double-edged razor blade of claim 5, wherein the pair of third notches comprise a groove having a V-shaped cross-section.