Patent US3208265A successfully refreshed from Google Patents.
US3208265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Erasability tester
Assignee: Mead Corp
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Filing: 1962-11-23
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Granted: 1965-09-28
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Expires: 1982-11-23
Abstract
No abstract record available.
Inventors
- 👤 Wyman C Rutledge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:56
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/86; G01N33/00; G01N33/34; G01N33/346
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
204 words
AN ERASABILITY TESTER COMPRISING: MEANS FOR HOLDING AND FIRMLY BACKING A SHEET OF TEST PAPER, MEANS FOR HOLDING AN ERASER IN CONSTANT PRESSURE CONTACT WITH A TEST AREA OF SAID PAPER, MEANS INCLUDING A MOTOR FOR MOVING SAID ERASER HOLDING MEANS WITH A CONSTANT RATE OF ABRADING MOVEMENT OVER SAID TEST AREA, MEANS FOR PROJECTING A LIGHT BEAM OF CONSTANT CROSS SECTIONNAL INTENSITY THROUGH SAID TEST AREA AND ADJACENT AREAS OF SAID PAPER, A FIRSTT PHOTOSENSITIVE MEANS CONNECTED TO AND MOVABLE WITH SAID ERASER HOLDING MEANS SO AS TO CONTINUALLY SENSE THE INCREASE IN A LIGHT TRANSMISSIVITY OF SAID TEST AREA AS THE PAPER THEREIN IS WORN AWAY BY SAID ERASER, A SECOND PHOTOSENSITIVE MEANS POISTIONED TO CONTINUALLY SENNSE THE LIGHT TIRANSMISSIVITY OF THE PAPER IN AN AREA ADJACENT TO SAID TEST AREA, A TIMER FOR MEASURING THE DURATION OF A TEST RUN, AND AN ELECTRONIC CIRCUIT CONNECTED TO SAID PHOTOSENSITIVE MEANS AND INCLUDING A RELAY CONTROLLING THE OPERATION OF SAID TIMER, SAID CIRCUIT BEING ADJUSTABLE TO VARY THE RESPONSIVENESS THEREOF TO SIGNAL STRENGTH FROM SAID PHOTOSENSITIVE MEANS, WHEREBY SAID TIMER IS STOPPED TO INDICATE THE TIME REQUIRED TO PRODUCE A PREDETERMINED INCREASE IN THE LIGHT TRANSMISSIVITY OF THE PAPER IN SAID TEST AREA.
Claim 2
Dependent Claim
204 words
AN ERASABILITY TESTER COMPRISING: MEANS FOR HOLDING AND FIRMLY BACKING A SHEET OF TEST PAPER, MEANS FOR HOLDING AN ERASER IN CONSTANT PRESSURE CONTACT WITH A TEST AREA OF SAID PAPER, MEANS INCLUDING A MOTOR FOR MOVING SAID ERASER HOLDING MEANS WITH A CONSTANT RATE OF ABRADING MOVEMENT OVER SAID TEST AREA, MEANS FOR PROJECTING A LIGHT BEAM OF CONSTANT CROSS SECTIONNAL INTENSITY THROUGH SAID TEST AREA AND ADJACENT AREAS OF SAID PAPER, A FIRSTT PHOTOSENSITIVE MEANS CONNECTED TO AND MOVABLE WITH SAID ERASER HOLDING MEANS SO AS TO CONTINUALLY SENSE THE INCREASE IN A LIGHT TRANSMISSIVITY OF SAID TEST AREA AS THE PAPER THEREIN IS WORN AWAY BY SAID ERASER, A SECOND PHOTOSENSITIVE MEANS POISTIONED TO CONTINUALLY SENNSE THE LIGHT TIRANSMISSIVITY OF THE PAPER IN AN AREA ADJACENT TO SAID TEST AREA, A TIMER FOR MEASURING THE DURATION OF A TEST RUN, AND AN ELECTRONIC CIRCUIT CONNECTED TO SAID PHOTOSENSITIVE MEANS AND INCLUDING A RELAY CONTROLLING THE OPERATION OF SAID TIMER, SAID CIRCUIT BEING ADJUSTABLE TO VARY THE RESPONSIVENESS THEREOF TO SIGNAL STRENGTH FROM SAID PHOTOSENSITIVE MEANS, WHEREBY SAID TIMER IS STOPPED TO INDICATE THE TIME REQUIRED TO PRODUCE A PREDETERMINED INCREASE IN THE LIGHT TRANSMISSIVITY OF THE PAPER IN SAID TEST AREA.
References Cited (Backward Citations)
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US2517330A
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US2721473A
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US2895326A
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US3065615A
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US3100981A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |