Back to results
US 6,648,536 B1Granted
Ergonomic writing instrument
OwnerJohn W. Bellueinventor
Life of this patent
Estimating the term…
Abstract
A writing instrument having an ergonomic configuration and methods for making the instrument. The instrument is elongated having an equilateral triangular cross-section and having a uniform partial twist along the length thereof. The partial twist permits flat surface engagement for the thumb, index finger and middle finger and for the dorsal first web space of the user's hand. The uniform twist in combination with the equilateral cross-sectional shape also permits tight packing in bulk. A method for making the instrument in the form of a rigid pencil is also provided.
Claims7
A writing instrument comprising:
- (a) an elongated body having a uniform equilateral triangular cross-section along the length thereof, said cross-section being configured into a uniform spiral around the body's central axis of a pitch between 10 and 15 degrees per inch of length thereof;
- and
- (b) a writing element within the body;
- (c) the overall twist of the spiral is less than 150 degrees.
1 more element
A writing instrument comprising:
- (a) an elongated body having a uniform equilateral triangular cross-section along the length thereof said body having a uniform spiral around its central axis of a pitch between 21 and 30 degrees per inch of length thereof, wherein the overall twist of the spiral section is less than 150 degrees or greater than 210 degrees;
- and
- (b) a writing element within said body.
Dependencies are inferred from the claim text.