Patent US3680805A successfully refreshed from Google Patents.
US3680805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light table with multiple axis tilting, and tension control of traveling illuminated media
Assignee: INTEGRAPHIC Inc
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Filing: 1969-09-03
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Granted: 1972-08-01
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Expires: 1989-09-03
Abstract
Abstract The invention concerns a light table having capability for adjustable tilting in multiple modes and to extreme angularity relative to horizontal, and with further provision for rapid reversal of film travel at any speed without loss of film tension, both hand and motor operation being enabled.
Inventors
- 👤 Wilton A Stewart
- 👤 Ying-Nien Yu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:16
CPC Classifications
B; B42; B42D; B42D19/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
182 words
In a light table assembly, the combination comprising a. a table having a top plate which is translucent to pass light therethrough to illuminate the underside of a sheet overlying the plate, b. a pair of spools spaced apart relative to the plate for winding and unwinding a sheet thereby to displace the sheet endwise of and over the plate, c. a pair of electrical motors and drive means connecting each motor in driving relation with one of said spools, therebeing structure carrying the drive means at opposite ends of the table for relative shifting into and out of driving relation with the spools, and d. control means operable in one mode to effect motor current supply to cause one motor to rotate one spool in sheet winding sense and the other motor to retard rotation of the other spool in sheet unwinding sense, and in another mode to effect motor current supply to cause said other motor to rotate said other spool in sheet winding sense and said one motor to retard rotation of said one spool in sheet unwinding sense.
Claim 2
Dependent Claim
182 words
In a light table assembly, the combination comprising a. a table having a top plate which is translucent to pass light therethrough to illuminate the underside of a sheet overlying the plate, b. a pair of spools spaced apart relative to the plate for winding and unwinding a sheet thereby to displace the sheet endwise of and over the plate, c. a pair of electrical motors and drive means connecting each motor in driving relation with one of said spools, therebeing structure carrying the drive means at opposite ends of the table for relative shifting into and out of driving relation with the spools, and d. control means operable in one mode to effect motor current supply to cause one motor to rotate one spool in sheet winding sense and the other motor to retard rotation of the other spool in sheet unwinding sense, and in another mode to effect motor current supply to cause said other motor to rotate said other spool in sheet winding sense and said one motor to retard rotation of said one spool in sheet unwinding sense.
Claim 3
Dependent Claim
29 words
The combination of claim 1 including support means releasably mounting said spools to said table for rotation about spool axes, the table and spools being tiltable as a unit.
Claim 4
Dependent Claim
34 words
The combination of claim 2 wherein the motors are shiftable with the drive means on said structure and parallel to said spool axes whereby the motors may be coupled to spools of different lengths.
Claim 5
Dependent Claim
46 words
The combination of claim 1 wherein said control means includes a variac, a transformer, switches through which different transformer windings may be coupled to the motors a manual control to operate the variac, and a cam operated by said manual control to selectively operate said switches.
Claim 6
Dependent Claim
25 words
The combination of claim 3 including manually rotatable control knobs coupled to said spools for transmitting rotary drive to the spools independently of said motors.
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |