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US 7,731,501 B2Granted
Underwater drawing tablet
OwnerMark Lloyd Haganinventor
Life of this patent
Estimating the term…
Abstract
An underwater writing and drawing tablet that stretches a length of waterproof (plastic) vellum between two rollers over a flat surface thereby enabling the user to easily draw or write on said vellum and permanently save the drawing and writing.
Claims18
An underwater writing tablet, comprising:
- first and second plastic rollers;
- first and second rotation knobs fitted at respective ends of said first and second plastic rollers;
- a face plate positioned between said first and second plastic rollers;
- a retractable member placed under said face plate and configured with drawing instrument holder;
- and
- a plastic vellum sheet rolled around said first and second plastic rollers and placed over said face place, wherein said plastic vellum sheet rolls between said first and second plastic rollers when one of said first and second rotation knobs is rotated by a user, and
- wherein said first and second plastic rollers, first and second rotation knobs and face plate are made of negative buoyant materials and the tablet has a slightly negative buoyancy at a depth of fifty feet so that the tablet does not sink or ascend rapidly underwater.
4 more elements
An underwater writing tablet, comprising:
- first and second plastic rollers;
- first and second rotation knobs fitted at respective ends of said first and second plastic rollers;
- a face plate positioned between said first and second plastic rollers;
- a retractable member placed under said face plate;
- a plastic vellum sheet rolled around said first and second plastic rollers and placed over said face plate wherein said first and second plastic rollers, first and second rotation knobs and face plate are made of negative buoyant materials and the tablet has a slightly negative buoyancy at a depth of fifty feet so that the tablet does not sink or ascend rapidly underwater;
- and
- a tension adjustment mechanism configured to maintain a consistent tension in the vellum sheet when the vellum sheet is rolled around the plastic rollers in an underwater environment.
4 more elements
An underwater writing tablet, comprising:
- first and second plastic rollers;
- first and second rotation knobs fitted at respective ends of said first and second plastic rollers;
- a face plate positioned between said first and second plastic rollers;
- and
- a plastic vellum sheet rolled around said first and second plastic rollers and placed over said face plate, wherein said plastic vellum sheet rolls between said first and second plastic rollers when one of said first and second rotation knobs is rotated by a user, and
- wherein said first and second plastic rollers, first and second rotation knobs and face plate are made of negative buoyant materials and the tablet has a slightly negative buoyancy at a depth of fifty feet so that the tablet does not sink or ascend rapidly underwater.
3 more elements
Dependencies are inferred from the claim text.