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US 2012/0058454 A1Published application
Sketching Devices having Improved Geometry
OwnerCharles Haberstroh, Martin P. Haberstrohinventors
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Abstract
An improved sketching device is disclosed having a substantially flat base and a regular grid of at least 20×20 bumps disposed on the base. A bottom of the each of the bumps can be spaced apart from a bottom of an adjacent bump by a first distance comprising between 0.005-5 mm. The raised bumps can be sized and positioned to form a plurality of intersecting grooves.
Claims13
An improved sketching device, comprising:
- a substantially flat base;
- and
- a regular grid of at least L×W bumps disposed on the base, wherein L is at least 20 and W is at least 20, such that a bottom of each bump is spaced apart from a bottom of an adjacent bump by a first distance comprising at least 0.005 mm and no more than 5 mm;
- and
- wherein the raised bumps are sized and positioned to form a plurality of intersecting grooves that act as tactile guides for use with drawing a trace on a paper with a marking instrument.
2 more elements
Dependencies are inferred from the claim text.