Patent US3750316A successfully refreshed from Google Patents.
US3750316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for secretly observing visual intelligence
Assignee: Honey Toy Industries Inc
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Filing: 1971-11-01
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Granted: 1973-08-07
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Expires: 1991-11-01
Abstract
Abstract A device for secretly observing visual intelligence. The device comprises a louvered arrangement of transparent and opaque zones extending in alternate succession, the opaque zones acting to permit observation from one direction along one surface of the louvered arrangement, through the transparent zones, of visual intelligence positioned along an opposite surface of the louvered arrangement, yet prevent observation of said visual intelligence from a counter-direction along said one surface.
Inventors
- 👤 H Braunhut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:58
CPC Classifications
G; G02; G02B; G02B5/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
200 words
A device for secretly observing visual intelligence; said device comprising observing means including a louvered array of transparent and opaque zones extending in alternate succession; said opaque zones including a plurality of spaced opaque elements extending longitudinally parallel to one another; each of said opaque elements including a surface inclined relative to an outer surface of said observing means to permit observation from one direction along said outer surface, through said transparent zones, of visual intelligence positioned along an opposite inner surface of said observing means and to prevent observation of said visual intelligence from a counter-direction along said outer surface; a sheet associated with said observing means; spacing means positioning said observing means and said sheet in superposed relation with said sheet confronting said inner surface of said observing means for defining a space between said observing means and said sheet for insertion of said visual intelligence therebetween, said sheet including opaque means of generally identical color as that of said opaque elements to impart to said transparent zones an appearance of opacity when said visual intelligence is absent between said observing means and said sheet and thereby concealing transparent nature of said transparent zones universally in all directions.
Claim 2
Independent Claim
200 words
A device for secretly observing visual intelligence; said device comprising observing means including a louvered array of transparent and opaque zones extending in alternate succession; said opaque zones including a plurality of spaced opaque elements extending longitudinally parallel to one another; each of said opaque elements including a surface inclined relative to an outer surface of said observing means to permit observation from one direction along said outer surface, through said transparent zones, of visual intelligence positioned along an opposite inner surface of said observing means and to prevent observation of said visual intelligence from a counter-direction along said outer surface; a sheet associated with said observing means; spacing means positioning said observing means and said sheet in superposed relation with said sheet confronting said inner surface of said observing means for defining a space between said observing means and said sheet for insertion of said visual intelligence therebetween, said sheet including opaque means of generally identical color as that of said opaque elements to impart to said transparent zones an appearance of opacity when said visual intelligence is absent between said observing means and said sheet and thereby concealing transparent nature of said transparent zones universally in all directions.
Claim 3
Dependent Claim
20 words
A device as claimed in claim 1 wherein said observing and opaque means each includes a sheet of plastic derivation.
Claim 4
Dependent Claim
26 words
A device as claimed in claim 14 wherein said transparent zones include transparent cellulose acetate butyrate interconnecting said opaque elements in fixed relation with one another.
Claim 5
Dependent Claim
27 words
A device as claimed in claim 3 wherein said observing means includes a pair of opposing transparent sheets between which is interposed said transparent cellulose acetate butyrate.
Claim 6
Dependent Claim
26 words
A device as claimed in claim 4 wherein said opaque elements are inclined relative to said pair of opposing sheets at an angle of substantially 30*.
Claim 7
Dependent Claim
27 words
A device as claimed in claim 1 wherein said observing means and said sheet are generally hingedly associated with one another into and out of superposed relation.
Claim 8
Dependent Claim
24 words
A device as claimed in claim 1 wherein said sheet includes a pair of transparent sheets between which is fIxedly interposed said opaque means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |