US3113033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light filter
Assignee: Corning Glass Works
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Filing: 1960-05-16
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Granted: 1963-12-03
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Expires: 1980-05-16
Abstract
No abstract record available.
Inventors
- 👤 John P Hoxie
- 👤 Alan J Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:58
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/226
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
A PHOSPHATE GLASS, LIGHT TRANSMITTING FILTER FOR AN INCANDESCENT LIGHTING UNIT CHARACTERIZED BY A COMBINATION OF COLOR CORRECTION ADDITIVES CONSISTING OF ABOUT 1-5% FERROUS OXIDE AND ABOUT 0.005-0.015% COBALT OXIDE ON THE BASIS OF A 6 MM. THICKNESS OF GLASS, THE RATIO OF FERROUS OXIDE TO COBALT OXIDE BEING AT LEAST 150:1 IN THE GLASS, THE AMOUNT OF FERROUS OXIDE BEING SUFFICIENT TO ABSORB INFRARED HEAT RAYS FROM INCANDESCANT ILUMINATION AND THE COBALT OXIDE, IN COMBINATION WITH THE FERROUS OXIDE, BEING PRESENT IN AN AMOUNT EFFECTIVE TO COLOR CORRECT THE TRANSMITTED PORTION OF THE ILLUMINATION TO SIMULATE ILLUMINATION FROM A LIGHT SOURCE HAVING A COLOR TEMPERATURE OF AT LEAST 3500*K. AND CHROMATICALLY CHARACTERISTICS SUCH THAT THE "X" VALUE IS NOT GREATER THAN 0.40 AND THE "Y" VALUE IS HOT GREATER THAN 0.41, THE PHOSPHATE GLASS, IN ADDITION TO THE COBALT OXIDE AND IRON OXIDE ADDITIVES, CONSISTING ESSENTIALLY OF 45-80% P2O5, UP TO 20% OF AT LEAST ONE DIVALENT METAL OXIDE, 5-25% AL2O3, UP TO 30% SIO2, AND UP TO 20% B2O3.
Claim 2
Dependent Claim
171 words
A PHOSPHATE GLASS, LIGHT TRANSMITTING FILTER FOR AN INCANDESCENT LIGHTING UNIT CHARACTERIZED BY A COMBINATION OF COLOR CORRECTION ADDITIVES CONSISTING OF ABOUT 1-5% FERROUS OXIDE AND ABOUT 0.005-0.015% COBALT OXIDE ON THE BASIS OF A 6 MM. THICKNESS OF GLASS, THE RATIO OF FERROUS OXIDE TO COBALT OXIDE BEING AT LEAST 150:1 IN THE GLASS, THE AMOUNT OF FERROUS OXIDE BEING SUFFICIENT TO ABSORB INFRARED HEAT RAYS FROM INCANDESCANT ILUMINATION AND THE COBALT OXIDE, IN COMBINATION WITH THE FERROUS OXIDE, BEING PRESENT IN AN AMOUNT EFFECTIVE TO COLOR CORRECT THE TRANSMITTED PORTION OF THE ILLUMINATION TO SIMULATE ILLUMINATION FROM A LIGHT SOURCE HAVING A COLOR TEMPERATURE OF AT LEAST 3500*K. AND CHROMATICALLY CHARACTERISTICS SUCH THAT THE "X" VALUE IS NOT GREATER THAN 0.40 AND THE "Y" VALUE IS HOT GREATER THAN 0.41, THE PHOSPHATE GLASS, IN ADDITION TO THE COBALT OXIDE AND IRON OXIDE ADDITIVES, CONSISTING ESSENTIALLY OF 45-80% P2O5, UP TO 20% OF AT LEAST ONE DIVALENT METAL OXIDE, 5-25% AL2O3, UP TO 30% SIO2, AND UP TO 20% B2O3.
References Cited (Backward Citations)
US2194784A
Cited
US2278501A
Cited
US2359789A
Cited
US2441853A
Cited
US2748006A
Cited
US2900264A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-12-02 | 1967-06-03 | 1967-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-02 | 1971-06-03 | 1971-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-02 | 1975-06-03 | 1975-12-03 | $7700.00 | Window Closed / Lapsed |