Patent US3349684A successfully refreshed from Google Patents.
US3349684A
Expired / Lapsed
US
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Copying machine exposure control
Assignee: Emerson Process Management Ltd
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Filing: 1964-10-26
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Granted: 1967-10-31
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Expires: 1984-10-26
Abstract
No abstract record available.
Inventors
- 👤 Tenny D Lode
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:26
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/72; G03B27/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
AN EXPOSURE CONTROL FOR COPYING MACHINES OF THE TYPE IN WHICH LIGHT SENSITIVE MATERIAL IS PASSED BY A LIGHT SOURCE INCLUDING A VARIABLE SPEED DRIVE MOTOR OPERABLE TO MOVE A SHEET OF THE MATERIAL PAST THE LIGHT SOURCE, SAID MOTOR INCLUDING ELECTRICAL FEED BACK MEANS DELIVERING A SIGNAL PROPORTIONAL TO ITS SPEED, PHOTOELECTRIC CELL MEANS TO SENSE LIGHT FROM THE LIGHT SOURCE AND TO DELIVER AN ELECTRICAL SIGNAL PROPORTIONAL TO LIGHT OUTPUT OF THE SOURCE, AND CIRCUIT MEANS FOR CONTROLLING THE SPEED OF SAID VARIABLE SPEED MOTOR, SAID CIRCUIT MEANS INCLUDING DIFFERENTIAL AMPLIFIER MEANS RECEIVING AN ELECTRICAL SIGNAL FROM SAID PHOTOELECTRIC CELL AND FROM SAID FEED BACK MEANS OF SAID MOTOR, SAID DIFFERENTIAL AMPLIFIER CONTROLLING THE SPEED OF SAID MOTOR SO THAT THE FEED BACK SIGNAL AND THE SIGNAL RECEIVED FROM SAID PHOTOELECTRIC CELL MEANS REACH A DESIRED RATIO.
Claim 2
Dependent Claim
139 words
AN EXPOSURE CONTROL FOR COPYING MACHINES OF THE TYPE IN WHICH LIGHT SENSITIVE MATERIAL IS PASSED BY A LIGHT SOURCE INCLUDING A VARIABLE SPEED DRIVE MOTOR OPERABLE TO MOVE A SHEET OF THE MATERIAL PAST THE LIGHT SOURCE, SAID MOTOR INCLUDING ELECTRICAL FEED BACK MEANS DELIVERING A SIGNAL PROPORTIONAL TO ITS SPEED, PHOTOELECTRIC CELL MEANS TO SENSE LIGHT FROM THE LIGHT SOURCE AND TO DELIVER AN ELECTRICAL SIGNAL PROPORTIONAL TO LIGHT OUTPUT OF THE SOURCE, AND CIRCUIT MEANS FOR CONTROLLING THE SPEED OF SAID VARIABLE SPEED MOTOR, SAID CIRCUIT MEANS INCLUDING DIFFERENTIAL AMPLIFIER MEANS RECEIVING AN ELECTRICAL SIGNAL FROM SAID PHOTOELECTRIC CELL AND FROM SAID FEED BACK MEANS OF SAID MOTOR, SAID DIFFERENTIAL AMPLIFIER CONTROLLING THE SPEED OF SAID MOTOR SO THAT THE FEED BACK SIGNAL AND THE SIGNAL RECEIVED FROM SAID PHOTOELECTRIC CELL MEANS REACH A DESIRED RATIO.
References Cited (Backward Citations)
CA598035A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-30 | 1971-05-01 | 1971-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-30 | 1975-05-01 | 1975-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-30 | 1979-05-01 | 1979-10-31 | $7700.00 | Window Closed / Lapsed |