US4298920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic gel changer for a spotlight
Assignee: Individual
•
Filing: 1979-06-07
•
Granted: 1981-11-03
•
Expires: 1999-06-07
Abstract
Abstract An automatic gel changer for remote operation, including a rotary solenoid associated with each gel frame to rotate such frames in and out of the path of the beam of light from the spotlight. Also associated with each gel frame is a damper for causing the motion of the gel frames as provided by the solenoids to be smooth and continuous.
Inventors
- 👤 Lewis Gluck
- 👤 Robin M. Tannenbaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:13
CPC Classifications
F; F21; F21V; F21V9/00; F21V9/40; F21V21/00; F21V21/14; F21V21/30; F21W; F21W2131/00; F21W2131/40; F21W2131/406
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
75 words
A remote gel changer for a spotlight, emitting a beam of light, comprisng a gel frame for motion between a removed position and a position for intercepting said beam of light, rotary solenoid means for causng said motion of said frame, electrical means for operating said solenoid, remote switch means for causing said electrical operation and a damper connected to said frame for providing smooth motion of said frame as caused by said rotary solenoid.
Claim 2
Dependent Claim
75 words
A remote gel changer for a spotlight, emitting a beam of light, comprisng a gel frame for motion between a removed position and a position for intercepting said beam of light, rotary solenoid means for causng said motion of said frame, electrical means for operating said solenoid, remote switch means for causing said electrical operation and a damper connected to said frame for providing smooth motion of said frame as caused by said rotary solenoid.
Claim 3
Dependent Claim
24 words
The invention accordng to claim 1 wherein a plurality of gel frames are provided, each attached to an individual solenoid means and a damper.
Claim 4
Dependent Claim
30 words
The invention accoding to claim 1 wherein said gel changer also comprises a pair of pinion gears, one affixed to said gel frame and one moved by said solenoid means.
Claim 5
Dependent Claim
30 words
The invention according to claim 1 wherein said damper includes a piston and a housing, said piston connected to said frame and said housing affixed with respect to said spotlight.
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) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |