Patent US3278754A successfully refreshed from Google Patents.
US3278754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive double document detector
Assignee: International Business Machines Corp
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Filing: 1964-09-16
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Granted: 1966-10-11
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Expires: 1984-09-16
Abstract
No abstract record available.
Inventors
- 👤 Leonard J Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:59
CPC Classifications
B; B65; B65H; B65H7/00; B65H7/02; B65H7/06; B65H7/12; B65H7/125; B07; B07C; B07C1/00; B07C1/02; G; G06; G06K; G06K13/00; G06K13/02; G06K13/06; G06K13/067; B65H2511/00; B65H2511/20; B65H2511/22; B65H2701/00; B65H2701/10; B65H2701/19; B65H2701/1912; Y; Y10; Y10S; Y10S209/00; Y10S209/932
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
183 words
A DEVICE FOR DETECTING THE FEEDING OF OVERLAPPED DOCUMENTS COMPRISING: A CHANNEL HAVING A PAIR OF MUTUALLY SPACED OPPOSED WALLS BETWEEN WHICH DOCUMENTS ARE ADAPTED TO BE FED IN ONE BY ONE SUCCESSION, MEANS FOR INTRODUCING AIR INTO SAID CHANNEL FROM A POINT ON EACH OF SAID WALLS ALONG THE DIRECTION OF DOCUMENT MOTION FOR SEPARATING A PLURALITY OF DOCUMENTS INADVERTENTLY INTRODUCED INTO SAID CHANNEL IN OVERLAPPING RELATIONSHIP, AN OPTICAL DETECTOR ASSEMBLY MOUNTED ON EACH OF SAID WALLS, EACH OF SAID OPTICAL DETECTOR ASSEMBLIES GENERATING LIGHT FOR APPLICATION INTO SAID CHANNEL AND INCLUDING A SOLAR CELL FOR GENERATING A CHARACTERISTIC CURRENT CURVE IN RESPONSE TO SAID LIGHT REFLECTED FROM A DOCUMENT PASSING BENEATH SAID ASSEMBLY, SAID CURVE HAVING A PLURALITY OF CURRENT VALUES CORRESPONDING TO VARIOUS DEPTHS AT WHICH ONE OF SAID DOCUMENTS IN PASSING BENEATH SAID OPTICAL ASSEMBLY, AND A SEPARATE AMPLIER RESPONSIVE TO SAID CURRENT GENERATED BY EACH OF SAID SOLAR CELLS FOR INDICATING THE PRESENCE OF A DOCUMENT, SAID AMPLIFIER BEING PRESET TO TURN ON AT A CURRENT VALUE CORRESPONDING TO A SELECTED DISTANCE BETWEEN SAID DOCUMENT AND SAID ASSEMBLY.
Claim 2
Independent Claim
183 words
A DEVICE FOR DETECTING THE FEEDING OF OVERLAPPED DOCUMENTS COMPRISING: A CHANNEL HAVING A PAIR OF MUTUALLY SPACED OPPOSED WALLS BETWEEN WHICH DOCUMENTS ARE ADAPTED TO BE FED IN ONE BY ONE SUCCESSION, MEANS FOR INTRODUCING AIR INTO SAID CHANNEL FROM A POINT ON EACH OF SAID WALLS ALONG THE DIRECTION OF DOCUMENT MOTION FOR SEPARATING A PLURALITY OF DOCUMENTS INADVERTENTLY INTRODUCED INTO SAID CHANNEL IN OVERLAPPING RELATIONSHIP, AN OPTICAL DETECTOR ASSEMBLY MOUNTED ON EACH OF SAID WALLS, EACH OF SAID OPTICAL DETECTOR ASSEMBLIES GENERATING LIGHT FOR APPLICATION INTO SAID CHANNEL AND INCLUDING A SOLAR CELL FOR GENERATING A CHARACTERISTIC CURRENT CURVE IN RESPONSE TO SAID LIGHT REFLECTED FROM A DOCUMENT PASSING BENEATH SAID ASSEMBLY, SAID CURVE HAVING A PLURALITY OF CURRENT VALUES CORRESPONDING TO VARIOUS DEPTHS AT WHICH ONE OF SAID DOCUMENTS IN PASSING BENEATH SAID OPTICAL ASSEMBLY, AND A SEPARATE AMPLIER RESPONSIVE TO SAID CURRENT GENERATED BY EACH OF SAID SOLAR CELLS FOR INDICATING THE PRESENCE OF A DOCUMENT, SAID AMPLIFIER BEING PRESET TO TURN ON AT A CURRENT VALUE CORRESPONDING TO A SELECTED DISTANCE BETWEEN SAID DOCUMENT AND SAID ASSEMBLY.
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) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |