US4267486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for displaying alphanumerical characters
Assignee: US Philips Corp
•
Filing: 1979-06-25
•
Granted: 1981-05-12
•
Expires: 1999-06-25
Abstract
Abstract Display device for alphanumeric characters manufactured from a block having cavities at the bottom of which electroluminescent diodes are provided. The block is obtained from a plastic material and the cavities are filled with a transparent resin, said plastic material and said resin belonging to groups of materials which cannot adhere together.
Inventors
- 👤 Jacques C. Thillays
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:17
CPC Classifications
G; G09; G09F; G09F9/00; G09F9/30; G09F9/302; G09F9/3023; H; H10; H10H; H10H20/00; H10H20/80; H10H20/85; H10H20/855; H10H20/856
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
93 words
A device for displaying alphanumerical characters comprising a block of insulating material having a plurality of cavities extending into said block, at least one semiconductor electroluminescent diode being provided at each cavity, and a transparent resin filling said cavities and contacting the walls of said cavities over the entire extent of said cavities in said block, said transparent resin and said insulating material of said block being formed of respective different substances which do not adhere together for forming a reflecting interface between said cavity walls and said resin along said entire extent.
Claim 2
Independent Claim
93 words
A device for displaying alphanumerical characters comprising a block of insulating material having a plurality of cavities extending into said block, at least one semiconductor electroluminescent diode being provided at each cavity, and a transparent resin filling said cavities and contacting the walls of said cavities over the entire extent of said cavities in said block, said transparent resin and said insulating material of said block being formed of respective different substances which do not adhere together for forming a reflecting interface between said cavity walls and said resin along said entire extent.
Claim 3
Dependent Claim
25 words
A device as in claim 1, wherein said insulating material from which said block is formed is impervious to light emitted by said electroluminescent diodes.
Claim 4
Dependent Claim
14 words
A device as in claim 1, wherein said transparent resin is an epoxy resin.
Claim 5
Dependent Claim
15 words
A device as in claim 3, wherein said epoxy resin is of the cycloaliphatic type.
Claim 6
Dependent Claim
16 words
A device as in claim 3, wherein said epoxy resin is of the bisphenol A type.
Claim 7
Dependent Claim
23 words
A device as in claim 1, wherein said block is formed from a thermoplastic material selected from the group, consisting essentially of polyolefins.
Claim 8
Dependent Claim
12 words
A device as in claim 6, wherein said thermoplastic material is polypropylene.
Claim 9
Dependent Claim
16 words
A device as in claim 6, wherein said thermoplastic material is a polymer of methyl pentene.
Claim 10
Dependent Claim
23 words
A device as in claim 1, wherein said block is formed from a thermoplastic material selected from the group consisting essentially of polyfluoroethenes.
Claim 11
Dependent Claim
12 words
A device as in claim 9, wherein said thermoplastic material is polytetrafluoroethylene.
Claim 12
Dependent Claim
23 words
A device as in claim 1, wherein a quantity of soot is added to said insulating material from which said block is formed.
Claim 13
Dependent Claim
14 words
A device as in claim 1, wherein said block is of a dark color.
Claim 14
Dependent Claim
13 words
A device as in claim 12, wherein said block has black cavity walls.
References Cited (Backward Citations)
US3256236A
Cited
US3609475A
Cited
US3772249A
Cited
US3711733A
Cited
US3840769A
Cited
US3780357A
Cited
US4058750A
Cited
US4013916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |