Patent US5355408A successfully refreshed from Google Patents.
Patent US4035631A successfully refreshed from Google Patents.
US4035631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projector lamp reflector
Assignee: General Electric Co
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Filing: 1975-12-15
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Granted: 1977-07-12
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Expires: 1995-12-15
Abstract
Abstract The concave reflecting surface of a projector reflector is shaped to provide a first set of reflecting areas which project a first set of light beams arranged to form a first tightly packed mosaic pattern at a plane, and a second set of reflecting areas which project a second set of light beams arranged to form a second tightly packed mosaic pattern superimposed on said first mosaic pattern.
Inventors
- 👤 Harold R. Day, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:05
CPC Classifications
F; F21; F21V; F21V7/00; F21V7/04; F21V7/09
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
A projector lamp unit comprising a concave reflector and a light source at a focus point of said reflector, and reflector having a first set of concave reflecting areas arranged to project a first set of light beams of given size from said light source to form a first tightly packed mosaic pattern at a plane, and said reflector having a second set of concave reflecting areas arranged to project a second set of light beams of given size from said light source to form a second tightly packed mosaic pattern superimposed on said first mosaic pattern.
Claim 2
Dependent Claim
97 words
A projector lamp unit comprising a concave reflector and a light source at a focus point of said reflector, and reflector having a first set of concave reflecting areas arranged to project a first set of light beams of given size from said light source to form a first tightly packed mosaic pattern at a plane, and said reflector having a second set of concave reflecting areas arranged to project a second set of light beams of given size from said light source to form a second tightly packed mosaic pattern superimposed on said first mosaic pattern.
Claim 3
Dependent Claim
37 words
A lamp unit as claimed in claim 1, in which said given size of the light beams of said first set thereof is different than said given size of the light beams of said second set thereof.
Claim 4
Dependent Claim
20 words
A lamp unit as claimed in claim 1, in which said light beams of both sets have circular cross sections.
Claim 5
Dependent Claim
32 words
A lamp unit as claimed in claim 3, in which the light beams of one of said sets thereof have diameters approximately twice as large as those of the other set thereof.
Claim 6
Dependent Claim
27 words
A lamp unit as claimed in claim 1, in which said sets of reflecting areas are arranged in concentric circles on the concave surface of said reflector.
Claim 7
Dependent Claim
27 words
A lamp unit as claimed in claim 5, in which said reflecting areas are circular, the remaining area of said concave surface having a generally ellipsoidal configuration.
Claim 8
Dependent Claim
54 words
A lamp unit as claimed in claim 1, in which said light source is an incandescent lamp having a filament and in which said reflecting areas are provided with concave curvatures such that each reflective area will reflect a pattern from said filament which substantially fills the corresponding light beam area at said plane.
Claim 9
Dependent Claim
22 words
A lamp unit as claimed in claim 1, in which each of said concave reflecting areas has a generally ellipsoidal concavity configuration.
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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) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |