Patent US3148581A successfully refreshed from Google Patents.
US3148581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cylindrical surface projection apparatus
Assignee: Xerox Corp
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Filing: 1961-01-30
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Granted: 1964-09-15
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Expires: 1981-01-30
Abstract
No abstract record available.
Inventors
- 👤 Ernest H Lehmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:52
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/221; G03G15/04; G03G15/043; G03G15/0435
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
XEROGRAPHIC RECORDING AND PROJECTION APPARATUS COMPRISING IN COMBINATION AN AXIALLY ROTATABLE CYLINDRICAL XEROGRAPHIC PLATE HAVING A SPECULAR REFLECTING OUTER SURFACE OF PHOTOCONDUCTIVE INSULATING MATERIAL, PROCESSING MEANS POSITIONED ADJACENT TO THE OUTER SURFACE OF SAID PLATE AND ADAPTED TO FORM AN ELECTROSTATIC LATENT IMAGE ON A LARGE SURFACE AREA OF SAID PLATE INCLUDING A LARGE ARC IN ITS CIRCUMFERENCE AND TO CONVERT SAID LATENT IMAGE INTO A PATTERN OF LIGHT DIFFUSING POWDER PARTICLES, AN ELONGATED LIGHT SOURCE POSITIONED IN A PLANE WITH AND IN PARALLEL AXIAL RELATIONSHIP TO A POWDER IMAGE BEARING SURFACE AREA OF SAID PLATE, A FIRST EXTENDED CYLINDRICAL CONVERGING LENS POSITIONED BETWEEN SAID PLATE AND SAID ELONGATED LIGHT SOURCE WITH ITS LENGTH PARALLEL WITH RESPECT TO THE AXIS OF SAID ELONGATED SOURCE AND SAID CYLINDRICAL PLATE AND WITH ITS AXIS OF SYMMETRY SUBSTANTIALLY PARALLEL TO THE AXIS OF SAID CYLINDRICAL PLATE AND TO A LINE JOINING SAID CYLINDRICAL PLATE AND SAID LIGHT SOURCE, A SECOND EXTENDED CONVERGING LENS POSITIONED BETWEEN SAID CYLINDRICAL PLATE AND SAID
Claim 2
Dependent Claim
167 words
XEROGRAPHIC RECORDING AND PROJECTION APPARATUS COMPRISING IN COMBINATION AN AXIALLY ROTATABLE CYLINDRICAL XEROGRAPHIC PLATE HAVING A SPECULAR REFLECTING OUTER SURFACE OF PHOTOCONDUCTIVE INSULATING MATERIAL, PROCESSING MEANS POSITIONED ADJACENT TO THE OUTER SURFACE OF SAID PLATE AND ADAPTED TO FORM AN ELECTROSTATIC LATENT IMAGE ON A LARGE SURFACE AREA OF SAID PLATE INCLUDING A LARGE ARC IN ITS CIRCUMFERENCE AND TO CONVERT SAID LATENT IMAGE INTO A PATTERN OF LIGHT DIFFUSING POWDER PARTICLES, AN ELONGATED LIGHT SOURCE POSITIONED IN A PLANE WITH AND IN PARALLEL AXIAL RELATIONSHIP TO A POWDER IMAGE BEARING SURFACE AREA OF SAID PLATE, A FIRST EXTENDED CYLINDRICAL CONVERGING LENS POSITIONED BETWEEN SAID PLATE AND SAID ELONGATED LIGHT SOURCE WITH ITS LENGTH PARALLEL WITH RESPECT TO THE AXIS OF SAID ELONGATED SOURCE AND SAID CYLINDRICAL PLATE AND WITH ITS AXIS OF SYMMETRY SUBSTANTIALLY PARALLEL TO THE AXIS OF SAID CYLINDRICAL PLATE AND TO A LINE JOINING SAID CYLINDRICAL PLATE AND SAID LIGHT SOURCE, A SECOND EXTENDED CONVERGING LENS POSITIONED BETWEEN SAID CYLINDRICAL PLATE AND SAID
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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) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |