Patent US2486867A successfully refreshed from Google Patents.
Patent US4021659A successfully refreshed from Google Patents.
US4021659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projector lamp reflector
Assignee: General Electric Co
•
Filing: 1975-10-30
•
Granted: 1977-05-03
•
Expires: 1995-10-30
Abstract
Abstract The concave reflecting surface of a projector lamp reflector is shaped in the form of a plurality of radial bands and a plurality of concentric circular bands to provide a multiple faceted surface for spreading the image formed by the reflector into a larger and smoother pattern and reducing the amount of imaging of a lamp filament and support post in the projected light pattern. Longer life and improved reproducibility of the molding tool are achieved.
Inventors
- 👤 Emmett H. Wiley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:26
CPC Classifications
F; F21; F21V; F21V7/00; F21V7/04; F21V7/09; F21V19/00; F21V19/0005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
117 words
A reflector and lamp combination comprising a reflector having a concave reflecting surface shaped to form a plurality of radial bands and a plurality of circular bands each of which intersects each of said radial bands thereby forming a plurality of reflective facets, and a lamp positioned within the concavity of said reflector and comprising a helical filament positioned along the optical axis of said reflector and said lamp also comprising a filament conductor positioned substantially parallel to and spaced from said filament, whereby in operation said reflective facets laterally diverge light from said filament thereby reducing optical imaging of said filament conductor and axially diverge light from said filament thereby reducing optical imaging of said filament.
Claim 2
Dependent Claim
117 words
A reflector and lamp combination comprising a reflector having a concave reflecting surface shaped to form a plurality of radial bands and a plurality of circular bands each of which intersects each of said radial bands thereby forming a plurality of reflective facets, and a lamp positioned within the concavity of said reflector and comprising a helical filament positioned along the optical axis of said reflector and said lamp also comprising a filament conductor positioned substantially parallel to and spaced from said filament, whereby in operation said reflective facets laterally diverge light from said filament thereby reducing optical imaging of said filament conductor and axially diverge light from said filament thereby reducing optical imaging of said filament.
Claim 3
Dependent Claim
17 words
A combination as claimed in claim 1, in which at least some of said facets are flat.
Claim 4
Dependent Claim
18 words
A combination as claimed in claim 1, in which at least some of said facets are curved convexly.
References Cited (Backward Citations)
US1253813A
Cited
US1394319A
Cited
US1639363A
Cited
FR667539A
Cited
DE1081393B
Cited
US2266190A
Cited
US2686255A
Cited
US2913570A
Cited
US3314331A
Cited
US3428800A
Cited
US3511983A
Cited
US3662165A
Cited
US3825742A
Cited
US3826913A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |