Patent US3220830A successfully refreshed from Google Patents.
US3220830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of developing a negative electrostatic latent image
Assignee: Kenffel & Esser Co
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Filing: 1961-10-02
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Granted: 1965-11-30
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Expires: 1981-10-02
Abstract
No abstract record available.
Inventors
- 👤 Thomas T Kashiwabara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:46
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/125; G03G9/13; G03G9/132
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A METHOD OF DEVELOPING A NEGATIVE ELECTROSTATIC LATENT IMAGE ON AN ELECTROPHOTOGRAPHIC MATERIAL RESISTANT TO TRICHLOROTRIFLUOROETHANE COMPRISING A CONDUCTIVE SUPPORT AND A LAYER COATED ON SAID SUPPORT, SAID LAYER COMPRISING PHOTOCONDUCTIVE ZINC OXIDE AND A BINDERR SELECTED FROM THE GROUP CONSISTING OF A POLYMER OF ESTERS OF ACRYLIC AND METHACRYLIC ACIDS, POLYVINYL ACETATE AND MODIFIED CASEIN, SAID METHOD COMPRISING THE STEPS OF: TREATING SAID MATERIAL WITH A LIQUID DEVELOPER COMPRISING TRICHLOROTRIFLUOROETHANE, ROSIN-MODIFIED PHENOL-FORMALDEHYDE RESIN AND FINELY DIVIDED CARBON BLACK WHICH IS ATTACHED IMAGEWISE TO SAID COATING AND ADHERES THERETO, AND ALLOWING THE TRICHLOROTRIFLUOROETHANE TO EVAPORATE AND DEPOSIT THE CARBON BLACK IMAGEWISE ON SAID LAYER.
Claim 2
Independent Claim
104 words
A METHOD OF DEVELOPING A NEGATIVE ELECTROSTATIC LATENT IMAGE ON AN ELECTROPHOTOGRAPHIC MATERIAL RESISTANT TO TRICHLOROTRIFLUOROETHANE COMPRISING A CONDUCTIVE SUPPORT AND A LAYER COATED ON SAID SUPPORT, SAID LAYER COMPRISING PHOTOCONDUCTIVE ZINC OXIDE AND A BINDERR SELECTED FROM THE GROUP CONSISTING OF A POLYMER OF ESTERS OF ACRYLIC AND METHACRYLIC ACIDS, POLYVINYL ACETATE AND MODIFIED CASEIN, SAID METHOD COMPRISING THE STEPS OF: TREATING SAID MATERIAL WITH A LIQUID DEVELOPER COMPRISING TRICHLOROTRIFLUOROETHANE, ROSIN-MODIFIED PHENOL-FORMALDEHYDE RESIN AND FINELY DIVIDED CARBON BLACK WHICH IS ATTACHED IMAGEWISE TO SAID COATING AND ADHERES THERETO, AND ALLOWING THE TRICHLOROTRIFLUOROETHANE TO EVAPORATE AND DEPOSIT THE CARBON BLACK IMAGEWISE ON SAID LAYER.
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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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |