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US 4,045,013 AGranted
Marker board
OwnerTheo M. S. Costerinventor
Life of this patent
Estimating the term…
Abstract
A marker board and a method for making same which board embodies a frame structure that defines the spatial extent of the board, an array of annular bar rings forming at least a part of the frame, and a plurality of flexible shells, each having peripheral base portions integrally formed with the rings and being independent and reversibly invertible with respect to the frame.
Claims2
A marker board comprising:
- a. a frame structure defining the spatial extent of the board;
- b. an array of annular base rings forming at least part of said frame structure;
- c. a plurality of flexible shells;
- d. peripheral base portions of said shells formed respectively integrally with said rings, said shells being independently and reversibly invertible with respect to said frame structure;
- e. said peripheral base portions are of increased flexibility as compared to adjacent portions of the shells;
- and
- f. respective tip portions of the shells are linked to adjacent portions of the shells by peripheral portions of increased flexibility as compared to the adjacent tip portions and are located within the spatial extent of said frame structure.
4 more elements
A marker board comprising:
- a. a frame structure defining the spatial extent of the board;
- b. an array of annular base rings forming at least part of said frame structure;
- c. a plurality of flexible shells;
- d. peripheral base portions of said shells formed respectively integrally with said rings, said shells being independently and reversibly invertible with respect to said frame structure;
- and
- e. said frame structure further comprising at least one frame bar which is formed integrally with and between an adjacent pair of rows of said rings.
3 more elements
Dependencies are inferred from the claim text.