Patent US3345294A successfully refreshed from Google Patents.
US3345294A
Expired / Lapsed
US
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Developer mix for electrostatic printing
Assignee: American Photocopy Equipment Co
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Filing: 1964-04-28
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Granted: 1967-10-03
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Expires: 1984-04-28
Abstract
No abstract record available.
Inventors
- 👤 Robert N Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:36
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/06; G03G13/08; G03G13/09; G03G9/00; G03G9/08; G03G9/083; G03G9/087; G03G9/08742; G03G9/08755
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A DEVELOPER MIX FOR USE IN ELECTROSTATIC PRINTING TO DEVELOP LATENT IMAGES, INCLUDING CHARGED AND UNCHARGED AREAS OF AN IMAGE-BEARING SHEET, SAID DEVELOPER MIX COMPRISING THE COMBINATION OF SEPARATE GRANULAR MAGNETICALLY ATTRACTABLE CARRIER PARTICLES AND A DEVELOPER POWDER COMPRISING A COLORING AGENT AND A RESIN HAVING A TRIBOELECTRIC RELATIONSHIP OF OPPOSITE POLARITY WITH RESPECT TO SAID MAGNETICALLY ATTRACTABLE GRANULES, AT LEAST A MAJOR PORTION OF SAID RESIN BEING COMPOSED OF A POLYAMIDE RESIN HAVING A SHARP MELTING POINT WITHIN THE RANGE OF ABOUT 70*C. TO ABOUT 165*C. WHEREBY DEVELOPED IMAGES OF SUBSTANTIALLY IMPROVED BLACK DENSITY MAY BE FORMED OVER EXTENDED OPERATING PERIODS.
Claim 2
Dependent Claim
102 words
A DEVELOPER MIX FOR USE IN ELECTROSTATIC PRINTING TO DEVELOP LATENT IMAGES, INCLUDING CHARGED AND UNCHARGED AREAS OF AN IMAGE-BEARING SHEET, SAID DEVELOPER MIX COMPRISING THE COMBINATION OF SEPARATE GRANULAR MAGNETICALLY ATTRACTABLE CARRIER PARTICLES AND A DEVELOPER POWDER COMPRISING A COLORING AGENT AND A RESIN HAVING A TRIBOELECTRIC RELATIONSHIP OF OPPOSITE POLARITY WITH RESPECT TO SAID MAGNETICALLY ATTRACTABLE GRANULES, AT LEAST A MAJOR PORTION OF SAID RESIN BEING COMPOSED OF A POLYAMIDE RESIN HAVING A SHARP MELTING POINT WITHIN THE RANGE OF ABOUT 70*C. TO ABOUT 165*C. WHEREBY DEVELOPED IMAGES OF SUBSTANTIALLY IMPROVED BLACK DENSITY MAY BE FORMED OVER EXTENDED OPERATING PERIODS.
References Cited (Backward Citations)
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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) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |