Patent US3913740A successfully refreshed from Google Patents.
US3913740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Folder for overhead projector and easel use
Assignee: Individual
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Filing: 1973-04-05
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Granted: 1975-10-21
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Expires: 1993-04-05
Abstract
Abstract A folder for the storage of transparencies and for their use in overhead projection and easel arrangement comprising a rectangular cover leaf, a plurality of independent transparencies, means pivotally joining said cover leaf and said transparencies along one edge so as to be pivotable about said edge, a pair of enclosure leaves integral with the edges of said cover leaf adjacent said pivotally mounted edge of said leaf, said enclosure leaves on their edges adjacent said pivotal joinder being tapered so as to be capable of forming an easel for the inclined cover leaf in one opened position. The enclosure leaves are provided with a tab and slot arrangement for interengagement to close the folder. The pivotal joining means may comprise a spiral wire winding along which holes are aligned for engagement with positioning pins of an overhead projector; the opposite edge is provided with aligned holes for putting the folder in a loose-leaf binder.
Inventors
- 👤 Aaron M Bisberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:44
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/64; G03B21/132
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
217 words
A folder for the storage of transparencies in a loose-leaf binder and for their use in overhead projection and easel arrangement comprising a rectangular cover leaf, a plurality of independent transparencies, means pivotally joining said cover leaf and said transparencies along one edge so as to be pivotable about said edge, and a pair of enclosure leaves integral with the edges of said cover leaf adjacent said pivotally mounted edge of said cover leaf, said enclosure leaves on their edges adjacent said pivotal joinder being tapered so as to be capable of forming an easel for the inclined cover leaf in one opened position, said cover leaf and transparencies being provided with holes aligned along said one edge, the holes of said transparencies being slightly larger than the holes of said cover leaf whereby said cover leaf can snugly engage positioning pins of an overhead projector coupler whereas said transparencies can be relatively freely mounted on said pins, said cover leaf including a tab projecting along the edge by which it is joined to one of said enclosure leaves, said tab being struck out of said one enclosure leaf, and said cover leaf being provided with holes aligned along the edge opposite said one edge, said holes being adapted to engage the rings of a loose-leaf binder.
Claim 2
Dependent Claim
217 words
A folder for the storage of transparencies in a loose-leaf binder and for their use in overhead projection and easel arrangement comprising a rectangular cover leaf, a plurality of independent transparencies, means pivotally joining said cover leaf and said transparencies along one edge so as to be pivotable about said edge, and a pair of enclosure leaves integral with the edges of said cover leaf adjacent said pivotally mounted edge of said cover leaf, said enclosure leaves on their edges adjacent said pivotal joinder being tapered so as to be capable of forming an easel for the inclined cover leaf in one opened position, said cover leaf and transparencies being provided with holes aligned along said one edge, the holes of said transparencies being slightly larger than the holes of said cover leaf whereby said cover leaf can snugly engage positioning pins of an overhead projector coupler whereas said transparencies can be relatively freely mounted on said pins, said cover leaf including a tab projecting along the edge by which it is joined to one of said enclosure leaves, said tab being struck out of said one enclosure leaf, and said cover leaf being provided with holes aligned along the edge opposite said one edge, said holes being adapted to engage the rings of a loose-leaf binder.
Claim 3
Dependent Claim
31 words
A folder according to claim 1, including interengageable means on said pair of enclosure leaves so as to be capable of enclosing said transparencies between said cover leaf and enclosure leaves.
Claim 4
Dependent Claim
34 words
A folder according to claim 1, including a protective overlay on top of said transparencies, pivotally mounted about one edge and joined to said cover leaf and said transparencies by said pivotally joining means.
Claim 5
Dependent Claim
24 words
A folder according to claim 1, including at least one mask joined to said cover leaf and said transparencies by said pivotally joining means.
Claim 6
Dependent Claim
40 words
A folder according to claim 1, including a tab projecting from said cover leaf along the edge by which said cover leaf is joined to one of said enclosure leaves, said tab being struck out of said one enclosure leaf.
Claim 7
Dependent Claim
64 words
A folder according to claim 1, including a protective overlay on top of said transparencies and at least one mask, said overlay and mask being joined to said cover leaf and said transparencies by said pivotally joining means, said pair of enclosure means being provided with interengageable means so as to be capable of enclosing said transparencies between said cover leaf and enclosure leaves.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |