US2913353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for developing electrostatic image
Assignee: General Dynamics Corp
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Filing: 1955-02-08
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Granted: 1959-11-17
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Expires: 1975-02-08
Abstract
No abstract record available.
Inventors
- 👤 Edward F Mayer
- 👤 Robert T Joy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:05
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/135; G03G15/00; G03G15/06; G03G15/10; G03G15/101
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
AN APPARATUS FOR DEVELOPING A VISUAL IMAGE FROM A LATENT ELECTROSTATIC IMAGE EXISTING ON: AN ELECTROPHOTOGRAPHIC PLATE CONSISTING OF A PHOTOCONDUCTIVE SURFACE BEARING THE LATENT ELECTROSTATIC IMAGE AND SUPPORTED ON AN ELECTRICALLY CONDUCTIVE BACKING MEMBER WHICH COMPRISES: MEANS ELECTRICALLY CONNECTING SAID BACKING MEMBER TO GROUND; A TANK ADAPTED TO CONTAIN A DISPERSION OF SOLID OPAQUE PARTICLES DISPERED IN AN ELECTRICALLY INSULATING LIQUID; MEANS ELECTRICALLY CONNECTING SAID TANK TO GROUND; A ROTATABLE APPLICATOR FORMED OF AN ELECTRICALLY SEMICONDUCTIVE OUTER LAYER CONVERING AN ELECTRICALLY CONDUCTIVE SUPPORTING CORE; SWITCH MEANS FOR SELECTIVELY MAKING AND BREAKING AN ELECTRICAL CIRCUIT BETWEEN SAID ELECTRICALLY CONDUCTIVE CORE AND GROUND; MEANS FOR PROVIDING A THIN FILM OF SAID DISPERSION TO THE SEMICONDUCTIVE SURFACE LAYER OF SAID APPLICATOR; AND MEANS FOR BRINGING SAID FILM-BEARING SURFACE INTO INTIMATE PHYSICAL CONTACT WITH THE PHOTOCONDUCTIVE MEMBER BEARING THE LATENT ELECTROSTATIC IMAGE IN ORDER TO RENDER THE LATENT IMAGE VISIBLE.
Claim 2
Independent Claim
147 words
AN APPARATUS FOR DEVELOPING A VISUAL IMAGE FROM A LATENT ELECTROSTATIC IMAGE EXISTING ON: AN ELECTROPHOTOGRAPHIC PLATE CONSISTING OF A PHOTOCONDUCTIVE SURFACE BEARING THE LATENT ELECTROSTATIC IMAGE AND SUPPORTED ON AN ELECTRICALLY CONDUCTIVE BACKING MEMBER WHICH COMPRISES: MEANS ELECTRICALLY CONNECTING SAID BACKING MEMBER TO GROUND; A TANK ADAPTED TO CONTAIN A DISPERSION OF SOLID OPAQUE PARTICLES DISPERED IN AN ELECTRICALLY INSULATING LIQUID; MEANS ELECTRICALLY CONNECTING SAID TANK TO GROUND; A ROTATABLE APPLICATOR FORMED OF AN ELECTRICALLY SEMICONDUCTIVE OUTER LAYER CONVERING AN ELECTRICALLY CONDUCTIVE SUPPORTING CORE; SWITCH MEANS FOR SELECTIVELY MAKING AND BREAKING AN ELECTRICAL CIRCUIT BETWEEN SAID ELECTRICALLY CONDUCTIVE CORE AND GROUND; MEANS FOR PROVIDING A THIN FILM OF SAID DISPERSION TO THE SEMICONDUCTIVE SURFACE LAYER OF SAID APPLICATOR; AND MEANS FOR BRINGING SAID FILM-BEARING SURFACE INTO INTIMATE PHYSICAL CONTACT WITH THE PHOTOCONDUCTIVE MEMBER BEARING THE LATENT ELECTROSTATIC IMAGE IN ORDER TO RENDER THE LATENT IMAGE VISIBLE.
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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) | 1962-11-16 | 1963-05-18 | 1963-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-16 | 1967-05-18 | 1967-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-16 | 1971-05-18 | 1971-11-17 | $7700.00 | Window Closed / Lapsed |