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US 5,809,656 AGranted
Paper knife
OwnerAri Lindberginventor
Life of this patent
Estimating the term…
Abstract
A knife for cutting a fold in paper, especially designed for opening an envelope. At least one end of the knife has two adjacent body walls (6) with a blade portion (3) placed between them and guiding sections (7, 10) in the body to guide the fold while cutting. At least body walls (6) of the knife are made of transparent material or furnished with a control hole (12) to facilitate arrangement of tip (2) into a starting position for cutting.
Claims5
A knife for cutting along a fold in a paper comprising:
- an elongate body having a longitudinal axis and symmetric body ends,
- each said body end including two adjacent body walls on respective sides of the longitudinal axis and a guide device between said body walls which rides along the fold as the fold passes between said body walls parallel to the longitudinal axis;
- an elongate blade fixed in said body and having respective free symmetric blade ends located at a respective said body end,
- each respective said blade end being completely located between said adjacent body walls of a respective said body end and including a blade tip and a sharpened cutting portion adjacent to said blade tip and to a respective said guide device, said sharpened cutting portion being formed of a first blade portion disposed parallel to the longitudinal axis and a second blade portion at an angle of 135.degree.-170.degree. to said first blade portion;
- and
- a viewing means for allowing each said blade tip to be viewed through an associated said body wall whereby insertion of said blade tip inside of the fold is viewable by a user.
3 more elements
Dependencies are inferred from the claim text.