Building block

Claim 2

A set of interfitting toy building blocks, with each block having rectangular dimensions of 3x by 2x by x and comprising, a substantially rectangular-shaped main body portion having dimensions of 2x by x by x four spaced corner portions, with each of said corner portions projecting outwardly from a respective corner of said main body portion, four indentations, with each of said indentations disposed between a respective pair of said corner portions, and wherein each of said corner portions is complementary in size and shape to each of said indentations.

Claim 3

A set of toy building blocks as defined in claim 1, and in which a. each of said indentations has a rectangular dimensions of x by x by x/2.

Claim 4

A substantially rectangular-shaped building block comprising a. a substantially flat front face, b. a substantially flat rear face, spaced from said front face in substantially parallel relation thereto, c. two oppositely disposed sides extending the length of said block between said faces, and d. two oppositely disposed ends extending the width of said block between said faces, e. each of said sides having (1) two oppositely disposed, substantially uniplanar end portions, and (2) an intermediate indentation separating said end portions, f. each of said end portions and each of said intermediate indentations having a length, parallel to said faces, equal to the width thereof, perpendicular to said faces, g. each of said intermediate indentations having a depth, perpendicular to the plane of the adjacent pair of said end portions, equal to one-half of said width thereof, h. each of said ends having (1) two oppositely disposed, substantially uniplanar end portions, and (2) an intermediate indentation separating said last mentioned end portions, i. each of said last mentioned end portions having (1) a length, parallel to said faces, equal to one-half said lengths and widths of said first mentioned end portions and said first mentioned indentations, and (2) a width, perpendicular to said faces, equal to said lengths and widths of said first mentioned end portions and said first mentioned indentations, and j. each of said second mentioned indentations having a length, parallel to said faces, a width, perpendicular to said faces, and a depth, perpendicular to the plane of the adjacent pair of said second mentioned end portions, equal to said length, width and depth, respectively, of each of said first mentioned indentations, k. said intermediate indentations and said second mentioned indentations being adapted to matingly receive portions of other blocks which have dimensions matching those of the indentations.

Claim 5

A substantially rectangular-shaped building block comprising a. a substantially flat front face, b. a substantially flat rear face, spaced from said front face in substantially parallel relation thereto, c. two oppositely disposed sides extending the length of said block between said faces, and d. two oppositely disposed ends extending the width of said block between said faces, e. each of said sides having (1) two oppositely disposed, substantially uniplanar end portions, and (2) an intermediate indentation separating said end portions, f. each of said end portions and each of said intermediate indentations having a length, parallel to said faces, equal to the width thereof, perpendicular to said faces, g. each of said intermediate indentations having a depth, perpendicular to the plane of the adjacent pair of said end portions, equal to one-half of said width thereof, h. each of said ends having (1) two oppositely disposed, substantially uniplanar end portions, and (2) an intermediate indentation separating said last mentioned end portions, i. each of said last mentioned end portions having (1) a length, parallel to said faces, equal to one-half said lengths and widths of said first mentioned end portions and said first mentioned indentations, and (2) a width, perpendicular to said faces, equal to said lengths and widths of said first mentioned end portions and said first mentioned indentations, and j. each of said second mentioned indentations having a length, parallel to said faces, a width, perpendicular to said faces, and a depth, perpendicular to the plane of the adjacent pair of said second mentioned end portions, equal to said length, width and depth, respectively, of each of said first mentioned indentations, k. said intermediate indentations and said second mentioned indentations being adapted to matingly receive portions of other blocks which have dimensions matching those of the indentations.

Claim 6

A building block as defined in claim 1, and in which said block comprises a. a substantially centrally disposed, rectangular-shaped main body portion, and b. four corner portions, each of which projects outwardly from a respective corner of said main body portion.

Claim 7

A building block as defined in claim 4, and in which a. each pair of adjacent ones of said corner portions are separated from each other by a respective one of said indentations.

Claim 8

A building block as defined in claim 5, and in which a. each of said corner portions is complementary in cross-sectional size and shape to each of said indentations.

Claim 9

A building block as defined in claim 6, and in which a. the length and width of each of said indentations is each equal to twice the depth of said indentation.

Claim 10

A building block as defined in claim 7, and in which a. said main body portion has (1) a length twice the length of each of said indentations, (2) a width equal to the length of each of said indentations, and (3) a thickness equal to the length of each of said indentations.