US3175117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric incandescent lamp having a light-diffusing bulb
Assignee: Egyesuelt Izzolampa es Villamossagi Rt
•
Filing: 1959-12-09
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Granted: 1965-03-23
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Expires: 1979-12-09
Abstract
No abstract record available.
Inventors
- 👤 Kardos Ferenc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:12
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/22; C03C17/23; H; H01; H01K; H01K1/00; H01K1/28; H01K1/32; H01K1/52; H01K1/54; H01K1/56; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/229; C03C2217/29; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
AN ELECTRIC INCANDESCENT LAMP COMPRISING A SEALED GLASS BULB HAVING A TUNGSTEN FILAMENT MOUNTED THEREIN AND HAVING ITS INSIDE SURFACE COATED WITH A BURNT-ON, ONOPOROUS, CONTINUOUS LIGHT-DIFFUSING LAYER CONSISTING ESSENTIALLY OF GRAIN SIZES BELOW 5 MICRONS FIRMLY ADHERING TO EACH OTHER AND TO SAID BULB, SAID COATING LAYER PREVENTING DISLODGMENT OF ANY IMPURITIES FROM THE INSIDE SURFACE OF SAID BULB, SAID LAYER COMPRISING TWO KINDS OF PARTICLES DIFFERING FROM EACH OTHER IN THEIR GRAIN SIZE BY AT LEAST ONE ORDER OF MAGNITUDE, ONE OF SAID KINDS OF PARTICLES BEING PRESENT IN AN AMOUNT OF ABOUT 2-19 TIMES THE AMOUNT OF THE OTHER OF SAID KINDS OF PARTICLES, THE GRAIN SIZE OF THE PARTICLES IN EACH OF SAID KINDS OF PARTICLES DIFFERING FROM EACH OTHER IN SIZE BY NOT MORE THAN BOUT 15%,
Claim 2
Dependent Claim
132 words
AN ELECTRIC INCANDESCENT LAMP COMPRISING A SEALED GLASS BULB HAVING A TUNGSTEN FILAMENT MOUNTED THEREIN AND HAVING ITS INSIDE SURFACE COATED WITH A BURNT-ON, ONOPOROUS, CONTINUOUS LIGHT-DIFFUSING LAYER CONSISTING ESSENTIALLY OF GRAIN SIZES BELOW 5 MICRONS FIRMLY ADHERING TO EACH OTHER AND TO SAID BULB, SAID COATING LAYER PREVENTING DISLODGMENT OF ANY IMPURITIES FROM THE INSIDE SURFACE OF SAID BULB, SAID LAYER COMPRISING TWO KINDS OF PARTICLES DIFFERING FROM EACH OTHER IN THEIR GRAIN SIZE BY AT LEAST ONE ORDER OF MAGNITUDE, ONE OF SAID KINDS OF PARTICLES BEING PRESENT IN AN AMOUNT OF ABOUT 2-19 TIMES THE AMOUNT OF THE OTHER OF SAID KINDS OF PARTICLES, THE GRAIN SIZE OF THE PARTICLES IN EACH OF SAID KINDS OF PARTICLES DIFFERING FROM EACH OTHER IN SIZE BY NOT MORE THAN BOUT 15%,
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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) | 1968-03-22 | 1968-09-21 | 1969-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-22 | 1972-09-21 | 1973-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-22 | 1976-09-21 | 1977-03-23 | $7700.00 | Window Closed / Lapsed |