US4427727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet for holding transparencies
Assignee: Slidex Corp
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Filing: 1982-07-26
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Granted: 1984-01-24
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Expires: 2002-07-26
Abstract
Abstract The disclosed sheet has a plurality of rectangular recesses in rows and columns for holding one transparency in each recess, and an inclined surface portion is formed substantially at the center of the bottom wall of each rectangular recess, so that reflection from the center of the bottom wall of the recess is angularly deviated from reflection from the center of the transparency held by the recess.
Inventors
- 👤 Jiro Ozeki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:47
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/64; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24628; Y10T428/24661
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
111 words
A sheet for holding transparencies, comprising a holder sheet, a plurality of rectangular recesses depressed from said holder sheet in rows and columns, a pair of earpieces extending from opposing sidewalls of each of said recesses toward the inside of the recess, a transparency-supporting wall means spaced from the earpieces of each of said recesses and extending toward the inside of the recess, a bottom wall depressed from said transparency-supporting wall means to a rectangular form at the center portion of said recess, the improvement comprising an inclined surface portion formed substantially at the center of the bottom wall of each of said recesses with an angle to the bottom wall.
Claim 2
Dependent Claim
111 words
A sheet for holding transparencies, comprising a holder sheet, a plurality of rectangular recesses depressed from said holder sheet in rows and columns, a pair of earpieces extending from opposing sidewalls of each of said recesses toward the inside of the recess, a transparency-supporting wall means spaced from the earpieces of each of said recesses and extending toward the inside of the recess, a bottom wall depressed from said transparency-supporting wall means to a rectangular form at the center portion of said recess, the improvement comprising an inclined surface portion formed substantially at the center of the bottom wall of each of said recesses with an angle to the bottom wall.
Claim 3
Dependent Claim
25 words
A sheet for holding transparencies as set forth in claim 1, wherein said inclined surface portion extends outward relative to the inside of said recess.
Claim 4
Dependent Claim
25 words
A sheet for holding transparencies as set forth in claim 1, wherein said inclined surface portion extends inward relative to the inside of said recess.
Claim 5
Dependent Claim
28 words
A sheet for holding transparencies as set forth in claim 1, wherein said inclined surface portion extends both inward and outward relative to the inside of said recess.
Claim 6
Dependent Claim
21 words
A sheet for holding transparencies as set forth in claim 1, wherein said inclined surface portion includes an inclined planar surface.
Claim 7
Dependent Claim
21 words
A sheet for holding transparencies as set forth in claim 1, wherein said inclined surface portion includes a smoothly curved surface.
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) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |