US3909649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lamp with light-diffusing coating
Assignee: General Electric Co
•
Filing: 1973-12-20
•
Granted: 1975-09-30
•
Expires: 1993-12-20
Abstract
Abstract A glass electric lamp bulb having on the inside surface thereof a light-diffusing coating of self-adherent silica particles having an average particle size, as measured by a scanning electron microscope, within the range from about 0.5 to 1.2 microns.
Inventors
- 👤 Vito J Arsena
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:37
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/28; H01K1/32
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
54 words
A glass electric lamp bulb having on the inside surface thereof a light-diffusing coating of silica particles adhering to said surface, randomly spaced from one another, and having a diameter within the range from about 0.5 to 1.2 microns, said coating characterized by a density of approximately 0.030 to 0.535 milligrams per square centimeter.
Claim 2
Dependent Claim
54 words
A glass electric lamp bulb having on the inside surface thereof a light-diffusing coating of silica particles adhering to said surface, randomly spaced from one another, and having a diameter within the range from about 0.5 to 1.2 microns, said coating characterized by a density of approximately 0.030 to 0.535 milligrams per square centimeter.
Claim 3
Dependent Claim
16 words
The glass electric lamp bulb claimed in claim 1 wherein said silica particles are crystalline silica.
Claim 4
Dependent Claim
16 words
The glass electric lamp bulb claimed in claim 1 wherein said silica particles are amorphous silica.
Claim 5
Dependent Claim
30 words
The glass electric lamp bulb claimed in claim 1 wherein the numerical preponderance by weight of said silica particles have a diameter larger than the longest wavelength of visible light.
Claim 6
Dependent Claim
46 words
The glass electric lamp bulb claimed in claim 1 wherein the luminous efficiency in lumens per watt of an ordinary incandescent lamp comprising such a coated bulb is of the order of 1.5 to 6% less than that of the same lamp with a clear bulb.
Claim 7
Dependent Claim
25 words
The glass electric lamp bulb claimed in claim 1 wherein said particles of silica have a diameter within the range from 0.6 to 0.7 microns.
Claim 8
Dependent Claim
25 words
The glass electric lamp bulb claimed in claim 1 wherein said particles of silica have a diameter within the range from 0.5 to 1.0 microns.
Claim 9
Dependent Claim
22 words
The glass electric lamp bulb claimed in claim 1 wherein a portion of said particles of silica are characterized as being nonspherical.
Claim 10
Dependent Claim
26 words
The glass electric lamp bulb as claimed in claim 1 wherein said coating density is approximately 0.070 + or - 0.041 mg of silica per cm2.
Claim 11
Dependent Claim
26 words
The glass electric lamp bulb as claimed in claim 1 wherein said coating density is approximately 0.315 + or - 0.070 mg of silica per cm2.
Claim 12
Dependent Claim
26 words
The glass electric lamp bulb as claimed in claim 1 wherein said coating density is approximately 0.462 + or - 0.072 mg of silica per cm2.
Claim 13
Dependent Claim
100 words
An incandescent lamp comprising a glass bulb having on the inside surface thereof a light-diffusing coating of silica particles adhering to said surface, randomly spaced from one another, and having a diameter of about 0.5 to 1.2 microns, said coating characterized by a density of approximately 0.030 to 0.535 milligrams per square centimeter, and a filament mounted inside said bulb, said coating serving a dual function of a light-diffusing means and as a means for preventing the dislodgment of any impurities from the inside surface of the glass bulb which would tend to lower the breakdown voltage across said filament.
Claim 14
Dependent Claim
100 words
An incandescent lamp comprising a glass bulb having on the inside surface thereof a light-diffusing coating of silica particles adhering to said surface, randomly spaced from one another, and having a diameter of about 0.5 to 1.2 microns, said coating characterized by a density of approximately 0.030 to 0.535 milligrams per square centimeter, and a filament mounted inside said bulb, said coating serving a dual function of a light-diffusing means and as a means for preventing the dislodgment of any impurities from the inside surface of the glass bulb which would tend to lower the breakdown voltage across said filament.
Claim 15
Dependent Claim
37 words
The lamp claimed in claim 12 wherein said bulb contains a fill gas and said tightly packed coating of silica prevents the dislodgment of any impurities from the bulb surface which would combine with the fill gas.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |