US3259581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid developer for electrostatic images
Assignee: Research Laboratories of Australia Pty Ltd
•
Filing: 1962-11-13
•
Granted: 1966-07-05
•
Expires: 1982-11-13
Abstract
No abstract record available.
Inventors
- 👤 Matkan Josef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:23
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/135; G03G9/1355
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
A LIQUID DEVELOPER FOR ELECTROSTATIC IMAGES CONSISTING ESSENTIALLY OF AN ELECTRICALLY INSULATING CARRIER LIQUID OF VOLUME RESISTIVITY IN EXCESS OF 10**10 OHM CENTIMETER AND A DIELECTRIC CONSTANT LESS THAN 3, PARTICLES OF CARBON BLACK SUSPENDED IN SAID CARRIER LIQUID AS A TONER, SAID CARBON BLACK PARTICLES HAVING BEEN PREVIOUSLY WETTED BY GRINDING IN AN OIL-CONTAINING DISPERSING MEDIUM, AND A METALLIC SOAP IN CONTACT WITH SAID SUSPENDED PARTICLES OF CARBON BLACK AS A POLARITY STABILIZER IMPARTING POSITIVE POLARITY TO SUCH PARTICLES AT LEAST IN THE PRESENCE OF A NEGATIVE ELECTROSTATIC FIELD, SAID METALLIC SOAP BEING PRESENT IN SUCH QUANTITY THAT THE METAL CONTENT OF THE SOAP IS AT LEAST ONE PERCENT BY WEIGHT OF THE CARBON BLACK PARTICLES IN SUSPENSION, AND SAID METALLIC SOAP BEING SELECTED FROM THE GROUP CONSISTING OF THE LINOLEATES OF THE METALS COBALT, MANGANESE, LEAD AND ZINC, NAPHTHENATES AND RESINATES OF THE METALS CALCIUM, COBALT, MANGANESE, LEAD AND ZINC, OCTOATES AND OLEATES OF THE METALS CALCIUM AND COBALT, PALMITATE OF THE METAL ZINC AND STEARATES OF THE METALS ALUMINUM, CALCIUM, LEAD AND ZINC.
Claim 2
Dependent Claim
176 words
A LIQUID DEVELOPER FOR ELECTROSTATIC IMAGES CONSISTING ESSENTIALLY OF AN ELECTRICALLY INSULATING CARRIER LIQUID OF VOLUME RESISTIVITY IN EXCESS OF 10**10 OHM CENTIMETER AND A DIELECTRIC CONSTANT LESS THAN 3, PARTICLES OF CARBON BLACK SUSPENDED IN SAID CARRIER LIQUID AS A TONER, SAID CARBON BLACK PARTICLES HAVING BEEN PREVIOUSLY WETTED BY GRINDING IN AN OIL-CONTAINING DISPERSING MEDIUM, AND A METALLIC SOAP IN CONTACT WITH SAID SUSPENDED PARTICLES OF CARBON BLACK AS A POLARITY STABILIZER IMPARTING POSITIVE POLARITY TO SUCH PARTICLES AT LEAST IN THE PRESENCE OF A NEGATIVE ELECTROSTATIC FIELD, SAID METALLIC SOAP BEING PRESENT IN SUCH QUANTITY THAT THE METAL CONTENT OF THE SOAP IS AT LEAST ONE PERCENT BY WEIGHT OF THE CARBON BLACK PARTICLES IN SUSPENSION, AND SAID METALLIC SOAP BEING SELECTED FROM THE GROUP CONSISTING OF THE LINOLEATES OF THE METALS COBALT, MANGANESE, LEAD AND ZINC, NAPHTHENATES AND RESINATES OF THE METALS CALCIUM, COBALT, MANGANESE, LEAD AND ZINC, OCTOATES AND OLEATES OF THE METALS CALCIUM AND COBALT, PALMITATE OF THE METAL ZINC AND STEARATES OF THE METALS ALUMINUM, CALCIUM, LEAD AND ZINC.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-04 | 1970-01-03 | 1970-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-04 | 1974-01-03 | 1974-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-04 | 1978-01-03 | 1978-07-05 | $7700.00 | Window Closed / Lapsed |