US4041344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ellipsoidal reflector lamp
Assignee: General Electric Co
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Filing: 1976-08-30
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Granted: 1977-08-09
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Expires: 1996-08-30
Abstract
Abstract A blown glass reflector lamp having an ellipsoidal reflector and a clear or lightly frosted face is disclosed.
Inventors
- 👤 Frank F. LaGiusa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:10
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/28; H01K1/32; H01K1/325
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
An ellipsoidal reflector lamp characterized by low brightness and high illumination comprising: a blown glass envelope having an ellipsoidal, specular surface and a translucent face, wherein the minor diameter of the ellipsoid defines the approximate boundary between said surface and said translucent face, said ellipsoid has an eccentricity of from 0.66 to 0.88 inclusive, said face is positioned no further than 1/2 d from the intersection of the axes of the ellipsoid, where d is the distance from said intersection to a focus of the ellipsoid, and wherein direct and reflected light are produced within approximately equal solid angles.
Claim 2
Dependent Claim
99 words
An ellipsoidal reflector lamp characterized by low brightness and high illumination comprising: a blown glass envelope having an ellipsoidal, specular surface and a translucent face, wherein the minor diameter of the ellipsoid defines the approximate boundary between said surface and said translucent face, said ellipsoid has an eccentricity of from 0.66 to 0.88 inclusive, said face is positioned no further than 1/2 d from the intersection of the axes of the ellipsoid, where d is the distance from said intersection to a focus of the ellipsoid, and wherein direct and reflected light are produced within approximately equal solid angles.
Claim 3
Dependent Claim
20 words
The ellipsoidal reflector as set forth in claim 1 and further comprising a filament intersecting the focus within said envelope.
Claim 4
Dependent Claim
17 words
The ellipsoidal reflector lamp as set forth in claim 2 wherein said face has a light frost.
Claim 5
Dependent Claim
23 words
The ellipsoidal reflector lamp as set forth in claim 3 wherein said envelope includes a neck portion having a heat shield positioned therein.
Claim 6
Dependent Claim
31 words
The ellipsoidal reflector lamp as set forth in claim 4 wherein said face comprises a section of a spherical surface joined to said minor diameter by the frustum of a cone.
Claim 7
Dependent Claim
18 words
The ellipsoidal reflector lamp as set forth in claim 5 wherein said ellipsoid has an eccentricity of 0.78.
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |