Patent US3607750A successfully refreshed from Google Patents.
US3607750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal coated metal carrier particles for electrostatic developers
Assignee: Continental Can Co Inc
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Filing: 1968-08-12
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Granted: 1971-09-21
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Expires: 1988-08-12
Abstract
Abstract In an electrostatic printing process employing a developer mixture comprised of electrically conductive carrier particles and electrostatically attractable toner particles, the effect of humidity of the air on the electrical conductivity of the carrier particles is substantially reduced by coating the carrier particles with a thin surface coating of a metal of the platinum group of the metals of Group VIII of the Periodic Table of Elements.
Inventors
- 👤 Kenneth W Rarey
- 👤 John B Kennedy Jr
- 👤 Marion J Ziminkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:54
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/113; G03G9/1139
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
34 words
The developer mixture of claim 1 wherein the carrier particle has a particle size of about 25 to 250 microns, and the toner particles have a particle size of about 1 to 30 microns.
Claim 2
Dependent Claim
12 words
The developer mixture of claim 1 wherein the metal coating is palladium.
Claim 3
Dependent Claim
12 words
The developer mixture of claim 1 wherein the carrier particle is nickel.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |