US3683225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Orange-reflective graticule scale for cathode ray tube
Assignee: Tektronix Inc
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Filing: 1970-03-20
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Granted: 1972-08-08
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Expires: 1990-03-20
Abstract
Abstract A graticule scale for a cathode ray tube is described which is made of a light reflecting material of chromatic color in the wavelength range of 5850 to 6500 angstroms, such as an orange of 6010 angstroms. The graticule scale may be provided on the inner surface of the flat glass faceplate of such tube and illuminated by light from an external source transmitted through the outer edge of such faceplate. The graticule scale of the present invention has the advantage that it is easily visible both in conditions of high ambient lighting due to its chromatic color and when used as a lighted graticule for photography purposes or for viewing in a dark room.
Inventors
- 👤 Marlow D Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:24
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J29/02; H01J29/10; H01J29/18; H01J29/28; H01J2229/00; H01J2229/89; H01J2229/8926
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
24 words
Apparatus in accordance with claim 1 in which the light reflecting material is of an orange color having a wavelength of about 6010 angstroms.
Claim 2
Dependent Claim
25 words
Apparatus in accordance with claim 1 in which the material of the graticule scale also includes a glass frit which is fused to the faceplate.
Claim 3
Dependent Claim
21 words
Apparatus in accordance with claim 1 in which the light reflecting material is a mixture of cadmium oxide and molybdenum oxide.
Claim 4
Dependent Claim
22 words
Apparatus in accordance with claim 4 in which the light reflecting material is provided in a glass frit containing lead borosilicate glass.
References Cited (Backward Citations)
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Cited
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US3207936A
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US3274421A
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Cited
US3361270A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |