Patent US3198649A successfully refreshed from Google Patents.
US3198649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled and fixing liquid developer for electro-photography and electroradiography
Assignee: Australian Government
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Filing: 1960-05-12
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Granted: 1965-08-03
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Expires: 1980-05-12
Abstract
No abstract record available.
Inventors
- 👤 Metcalfe Kenneth Archibald
- 👤 Wright Robert John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:12
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13; G03G9/131; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
A CONTROLLED AND FIXING LIQUID DEVELOPER FOR ELECTRIC-PHOTOGRAPHY AND ELECTRO-RADIOGRAPHY COMPRISING A PARTICULATE PIGMENT SUBSTANCE, A CONTROL AGENT COATING THE SAID PARTICULATE SUBSTANCE AND CONSTITUTING A CONTROL COATING THEREON, SAID CONTROL AGENT INFLUENCING THE ELECTROSTATIC BEHAVIOR OF SAID SUBSTANCE SAID CONTROL AGENT INCLUDING IN COMBINATION NATURAL AND SYNTHETIC RUBBERS, SAID AGENT FORMING A BASE WITH THE PIGMENT SUBSTANCE, AND AN ELECTRICALLY INSULATING CARRIER LIQUID FOR THE COATED PIGMENT SUBSTANCE, SAID CONTROL AGENT BEING SUFFICIENTLY SOLUBLE IN SAID LIQUID TO MAINTAIN THE OUTER SURFACE OF THE CONTROL COATING IN A PARTLY DISSOLVED STATE TO CONSTITUTE A FIXING AGENT, SAID AGENT BEING SUFFICIENTLY INSOLUBLE IN SAID LIQUID TO INSURE RETENTION OF AT LEAST PART OF THE CONTROL COATING ON SAID SUBSTANCE THROUGHOUT A DEVELOPING OPERATION, SAID COATED PIGMENT SUBSTANCE BEING SUSPENDED IN THE CARRIER LIQUID.
Claim 2
Dependent Claim
133 words
A CONTROLLED AND FIXING LIQUID DEVELOPER FOR ELECTRIC-PHOTOGRAPHY AND ELECTRO-RADIOGRAPHY COMPRISING A PARTICULATE PIGMENT SUBSTANCE, A CONTROL AGENT COATING THE SAID PARTICULATE SUBSTANCE AND CONSTITUTING A CONTROL COATING THEREON, SAID CONTROL AGENT INFLUENCING THE ELECTROSTATIC BEHAVIOR OF SAID SUBSTANCE SAID CONTROL AGENT INCLUDING IN COMBINATION NATURAL AND SYNTHETIC RUBBERS, SAID AGENT FORMING A BASE WITH THE PIGMENT SUBSTANCE, AND AN ELECTRICALLY INSULATING CARRIER LIQUID FOR THE COATED PIGMENT SUBSTANCE, SAID CONTROL AGENT BEING SUFFICIENTLY SOLUBLE IN SAID LIQUID TO MAINTAIN THE OUTER SURFACE OF THE CONTROL COATING IN A PARTLY DISSOLVED STATE TO CONSTITUTE A FIXING AGENT, SAID AGENT BEING SUFFICIENTLY INSOLUBLE IN SAID LIQUID TO INSURE RETENTION OF AT LEAST PART OF THE CONTROL COATING ON SAID SUBSTANCE THROUGHOUT A DEVELOPING OPERATION, SAID COATED PIGMENT SUBSTANCE BEING SUSPENDED IN THE CARRIER LIQUID.
Claim 3
Independent Claim
94 words
A METHOD OF FIXING A DEVELOPER SUBSTANCE, WHICH IS SUSPENDED IN AN ELECTRICALLY INSULATING LIQUID CARRIER, ON A SURFACE HAVING AN ELECTROSTATIC IMAGE; SAID METHOD COMPRISING COATING SAID SUBSTANCE WITH A MATERIAL INFLUENCING THE ELECTROSTATIC BEHAVIOR THEREOF AND WHICH SUBSTANCE IS PARTLY SOLUBLE IN SAID CARRIER DISPERSING THE THUSLY COATED SUBSTANCE IN SAID CARRIER WHEREBY SAID MATERIAL IS RENDERED TACKY APPLYING SAID CARRIER WITH THE COATED DEVELOPER SUBSTANCE TO SAID SURFACE TO DEPOSIT SAID COATED DEVELOPER SUBSTANCE ON SAID IMAGE, AND PHYSICALLY BONDING SAID DEVELOPER SUBSTANCE TO SAID SURFACE BY MEANS OF SAID MATERIAL.
Claim 4
Independent Claim
94 words
A METHOD OF FIXING A DEVELOPER SUBSTANCE, WHICH IS SUSPENDED IN AN ELECTRICALLY INSULATING LIQUID CARRIER, ON A SURFACE HAVING AN ELECTROSTATIC IMAGE; SAID METHOD COMPRISING COATING SAID SUBSTANCE WITH A MATERIAL INFLUENCING THE ELECTROSTATIC BEHAVIOR THEREOF AND WHICH SUBSTANCE IS PARTLY SOLUBLE IN SAID CARRIER DISPERSING THE THUSLY COATED SUBSTANCE IN SAID CARRIER WHEREBY SAID MATERIAL IS RENDERED TACKY APPLYING SAID CARRIER WITH THE COATED DEVELOPER SUBSTANCE TO SAID SURFACE TO DEPOSIT SAID COATED DEVELOPER SUBSTANCE ON SAID IMAGE, AND PHYSICALLY BONDING SAID DEVELOPER SUBSTANCE TO SAID SURFACE BY MEANS OF SAID MATERIAL.
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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) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |