Transparency slide unit as well as method and apparatus for producing the same

Claim 2

A substantially rectangular transparency slide unit for use with projectors and viewers which consists of a film transparency mounted in a centrally located window opening between a first frame half and a second frame half, A. each frame half being identical in the following respects:

Claim 3

being a separate plate-like member that is composed of one piece of plastic,

Claim 4

being a separate plate-like member that is composed of one piece of plastic,

Claim 5

said first and second frame halves being oriented 180* with respect to each other in their pressed together position,

Claim 6

said first and second frame halves being oriented 180* with respect to each other in their pressed together position,

Claim 7

a first row disposed above and parallel to said top edge of the rectangular opening,

Claim 8

a first row disposed above and parallel to said top edge of the rectangular opening,

Claim 9

A substantially rectangular transparency slide unit for use with projectors and viewers which consists of a film transparency mounted in a centrally located window opening between a first frame half and a second frame half, A. each frame half being identical in the following respects: 1. being a separate plate-like member that is composed of one piece of plastic, 2. having a rectangular exterior configuration defined by a first longitudinal exterior edge, a second longitudinal exterior edge of equal length, and upper and lower transverse exterior edges connecting the ends of said longitudinal exterior edges, the length of said longitudinal exterior edges being longer than said transverse edges, 3. having a rectangular opening disposed interiorly of said longitudinal and transverse edges and having a first side edge paralleling said first longitudinal exterior edge and a second side edge paralleling said second longitudinal exterior edge, as well as a top edge and a bottom edge, 4. being substantially identical to each other as far as both the exterior configuration and the size of the interior rectangular opening is concerned, 5. having a thickened strip-like marginal portion a. that is disposed only along said first longitudinal exterior edge, b. that has a thickness which is about twice the thickness of the remainder of the frame half, c. that has a width that approximately corresponds to half the difference between the length of a longitudinal exterior edge and the width of the transparency that is mounted in the film unit, d. that forms a shoulder that is stepped inwardly and downwardly towards said first side edge of said rectangular opening, 6. the second side edge of said rectangular opening being closer to said second longitudinal exterior edge than said first side edge of said rectangular opening is to the first longitudinal exterior edge of each frame, 7. having a facing surface that comprises a. the area from said top edge of the rectangular opening to said upper transverse exterior edge, b. the area from said bottom edge of the rectangular opening to said lower transverse exterior edge, c. the area from said first side edge of the rectangular opening to the step formed by the shoulder, and d. the area from said second edge of the rectangular opening to said second longitudinal exterior edge, B. said first and second frame halves being pressed together so that the rectangular opening in each frame half coincides with the rectangular opening in the other frame half, 1. said first and second frame halves being oriented 180* with respect to each other in their pressed together position, 2. said first and second frame halves having their facing surfaces substantially covering each other, 3. the second longitudinal exterior edge of each frame half being disposed closely adjacent the step formed by the shoulder of the other frame half, C. a film transparency mounted between said first and second frame halves so that the image thereon is exposed within said rectangular opening, one side edge of said film transparency being disposed closely adjacent to the step formed by one shoulder of one frame half and the other side edge of said film transparency being disposed closely adjacent to the step formed by the shoulder of the other frame half, D. peg-like projections extending outwardly from at least one facing surface and consisting of 1. a first row disposed above and parallel to said top edge of the rectangular opening, 2. a second row disposed below and parallel to said bottom edge of the rectangular opening, 3. said first and second rows being spaced apart a distance which equals or only slightly exceeds the distance between the top and bottom edges of the film transparency, 4. no peg-like projections or any other projections positioned in the space between said first row and said second row, E. a plurality of holes in the facing surfaces opposite said peg-like projections each hole having a diameter large enough to permit the passage of said peg-like projections therethrough, F. the outer end of each peg-like projection having a dimension perpendicular to its axis which is greater than the minimum diameter of the hole through which it has passed whereby the two frame halves are secured together against ordinary manual disengagement.

Claim 10

A substantially rectangular transparency slide unit for use with projectors and viewers which consists of a film transparency mounted in a centrally located window opening between a first frame half and a second frame half, A. each frame half being identical in the following respects: 1. being a separate plate-like member that is composed of one piece of plastic, 2. having a rectangular exterior configuration defined by a first longitudinal exterior edge, a second longitudinal exterior edge of equal length, and upper and lower transverse exterior edges connecting the ends of said longitudinal exterior edges, the length of said longitudinal exterior edges being longer than said transverse edges, 3. having a rectangular opening disposed interiorly of said longitudinal and transverse edges and having a first side edge paralleling said first longitudinal exterior edge and a second side edge paralleling said second longitudinal exterior edge, as well as a top edge and a bottom edge, 4. being substantially identical to each other as far as both the exterior configuration and the size of the interior rectangular opening is concerned, 5. having a thickened strip-like marginal portion a. that is disposed only along said first longitudinal exterior edge, b. that has a thickness which is about twice the thickness of the remainder of the frame half, c. that has a width that approximately corresponds to half the difference between the length of a longitudinal exterior edge and the width of the transparency that is mounted in the film unit, d. that forms a shoulder that is stepped inwardly and downwardly towards said first side edge of said rectangular opening, 6. the second side edge of said rectangular opening being closer to said second longitudinal exterior edge than said first side edge of said rectangular opening is to the first longitudinal exterior edge of each frame, 7. having a facing surface that comprises a. the area from said top edge of the rectangular opening to said upper transverse exterior edge, b. the area from said bottom edge of the rectangular opening to said lower transverse exterior edge, c. the area from said first side edge of the rectangular opening to the step formed by the shoulder, and d. the area from said second edge of the rectangular opening to said second longitudinal exterior edge, B. said first and second frame halves being pressed together so that the rectangular opening in each frame half coincides with the rectangular opening in the other frame half, 1. said first and second frame halves being oriented 180* with respect to each other in their pressed together position, 2. said first and second frame halves having their facing surfaces substantially covering each other, 3. the second longitudinal exterior edge of each frame half being disposed closely adjacent the step formed by the shoulder of the other frame half, C. a film transparency mounted between said first and second frame halves so that the image thereon is exposed within said rectangular opening, one side edge of said film transparency being disposed closely adjacent to the step formed by one shoulder of one frame half and the other side edge of said film transparency being disposed closely adjacent to the step formed by the shoulder of the other frame half, D. peg-like projections extending outwardly from at least one facing surface and consisting of 1. a first row disposed above and parallel to said top edge of the rectangular opening, 2. a second row disposed below and parallel to said bottom edge of the rectangular opening, 3. said first and second rows being spaced apart a distance which equals or only slightly exceeds the distance between the top and bottom edges of the film transparency, 4. no peg-like projections or any other projections positioned in the space between said first row and said second row, E. a plurality of holes in the facing surfaces opposite said peg-like projections each hole having a diameter large enough to permit the passage of said peg-like projections therethrough, F. the outer end of each peg-like projection having a dimension perpendicular to its axis which is greater than the minimum diameter of the hole through which it has passed whereby the two frame halves are secured together against ordinary manual disengagement.

Claim 11

A transparency slide unit according to claim 1, wherein the inner sides of those portions of the two frame halves, which partially cover the transparency, are recessed to a depth exceeding half the thickness of the transparency, said recesses being bordered inwardly in the direction towards the openings of the frame halves by means of an elevated border area having a rough surface in contact with the transparency, the height of said elevated border area being so choosen that the transparency is kept braced and clamped only around and close to its exposed picture while the remainder thereof is lying free between the frame halves.

Claim 12

a second row disposed below and parallel to said bottom edge of the rectangular opening,

Claim 13

a second row disposed below and parallel to said bottom edge of the rectangular opening,

Claim 14

said first and second frame halves having their facing surfaces substantially covering each other,

Claim 15

said first and second frame halves having their facing surfaces substantially covering each other,

Claim 16

having a rectangular exterior configuration defined by a first longitudinal exterior edge, a second longitudinal exterior edge of equal length, and upper and lower transverse exterior edges connecting the ends of said longitudinal exterior edges, the length of said longitudinal exterior edges being longer than said transverse edges,

Claim 17

having a rectangular exterior configuration defined by a first longitudinal exterior edge, a second longitudinal exterior edge of equal length, and upper and lower transverse exterior edges connecting the ends of said longitudinal exterior edges, the length of said longitudinal exterior edges being longer than said transverse edges,

Claim 18

being substantially identical to each other as far as both the exterior configuration and the size of the interior rectangular opening is concerned,

Claim 19

being substantially identical to each other as far as both the exterior configuration and the size of the interior rectangular opening is concerned,

Claim 20

no peg-like projections or any other projections positioned in the space between said first row and said second row, E. a plurality of holes in the facing surfaces opposite said peg-like projections each hole having a diameter large enough to permit the passage of said peg-like projections therethrough, F. the outer end of each peg-like projection having a dimension perpendicular to its axis which is greater than the minimum diameter of the hole through which it has passed whereby the two frame halves are secured together against ordinary manual disengagement.

Claim 21

no peg-like projections or any other projections positioned in the space between said first row and said second row, E. a plurality of holes in the facing surfaces opposite said peg-like projections each hole having a diameter large enough to permit the passage of said peg-like projections therethrough, F. the outer end of each peg-like projection having a dimension perpendicular to its axis which is greater than the minimum diameter of the hole through which it has passed whereby the two frame halves are secured together against ordinary manual disengagement.

Claim 22

having a thickened strip-like marginal portion a. that is disposed only along said first longitudinal exterior edge, b. that has a thickness which is about twice the thickness of the remainder of the frame half, c. that has a width that approximately corresponds to half the difference between the length of a longitudinal exterior edge and the width of the transparency that is mounted in the film unit, d. that forms a shoulder that is stepped inwardly and downwardly towards said first side edge of said rectangular opening,

Claim 23

having a thickened strip-like marginal portion a. that is disposed only along said first longitudinal exterior edge, b. that has a thickness which is about twice the thickness of the remainder of the frame half, c. that has a width that approximately corresponds to half the difference between the length of a longitudinal exterior edge and the width of the transparency that is mounted in the film unit, d. that forms a shoulder that is stepped inwardly and downwardly towards said first side edge of said rectangular opening,

Claim 24

the second side edge of said rectangular opening being closer to said second longitudinal exterior edge than said first side edge of said rectangular opening is to the first longitudinal exterior edge of each frame,

Claim 25

the second side edge of said rectangular opening being closer to said second longitudinal exterior edge than said first side edge of said rectangular opening is to the first longitudinal exterior edge of each frame,

Claim 26

having a facing surface that comprises a. the area from said top edge of the rectangular opening to said upper transverse exterior edge, b. the area from said bottom edge of the rectangular opening to said lower transverse exterior edge, c. the area from said first side edge of the rectangular opening to the step formed by the shoulder, and d. the area from said second edge of the rectangular opening to said second longitudinal exterior edge, B. said first and second frame halves being pressed together so that the rectangular opening in each frame half coincides with the rectangular opening in the other frame half,

Claim 27

having a facing surface that comprises a. the area from said top edge of the rectangular opening to said upper transverse exterior edge, b. the area from said bottom edge of the rectangular opening to said lower transverse exterior edge, c. the area from said first side edge of the rectangular opening to the step formed by the shoulder, and d. the area from said second edge of the rectangular opening to said second longitudinal exterior edge, B. said first and second frame halves being pressed together so that the rectangular opening in each frame half coincides with the rectangular opening in the other frame half,