US4181930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp reflector unit
Assignee: US Philips Corp
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Filing: 1977-08-10
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Granted: 1980-01-01
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Expires: 1997-08-10
Abstract
Abstract A lamp reflector unit to be used for projection purposes and comprising a reflector body and a light source accommodated therein. The reflector body is covered with a reflective layer extending from the top of the reflector body up to a distance from the largest circumferential edge of the reflector body. The distance is between 3 mm and 10 mm, dependent on the desired angle of divergence of the reflected beam light rays.
Inventors
- 👤 Jan A. C. Mewissen
- 👤 Ferdinandus M. J. Van Beek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:21
CPC Classifications
H; H01; H01K; H01K7/00; H01K7/02; F; F21; F21V; F21V29/00; F21V29/50; F21V29/502; F21V29/505
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
63 words
A lamp reflector unit to be used for projection purposes and comprising a cup-shaped reflector body, said body having a reflective layer, an electrical light source disposed within said reflector body, said reflective layer extending over the interior of said reflector up to a distance from the largest circumferential edge of said reflector body, said distance being between 3 mm and 10 mm.
Claim 2
Dependent Claim
63 words
A lamp reflector unit to be used for projection purposes and comprising a cup-shaped reflector body, said body having a reflective layer, an electrical light source disposed within said reflector body, said reflective layer extending over the interior of said reflector up to a distance from the largest circumferential edge of said reflector body, said distance being between 3 mm and 10 mm.
Claim 3
Dependent Claim
19 words
A lamp reflector unit as claimed in claim 1, wherein said distance is between 5 mm and 9 mm.
References Cited (Backward Citations)
US3414762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-31 | 1983-07-02 | 1984-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-31 | 1987-07-02 | 1988-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-31 | 1991-07-02 | 1992-01-01 | $7700.00 | Window Closed / Lapsed |