US5121164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for maintaining a liquid composition
Assignee: HP Indigo BV
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Filing: 1988-06-06
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Granted: 1992-06-09
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Expires: 2008-06-06
Abstract
Abstract A method for maintaining a preselected concentrations of first and second charge directors in a toner composition, where such composition is being subjected to a use in which initial concentrations of the first and second charge directors are being depleted.
Inventors
- 👤 Benzion Landa
- 👤 Yehuda Niv
- 👤 Israel Grossinger
- 👤 Moshe Levanon
- 👤 Yossi Adam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:08
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G13/00; G03G13/01; G03G13/013; G03G13/0131; G03G13/06; G03G13/10; G03G15/00; G03G15/06; G03G15/10; G03G15/104
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
134 words
A method for maintaining first and second concentrations of respective first and second charge directors at respective given first and second values in a toner composition comprising pigmented particles, said method comprising the following steps: developing at least one color patch using said toner composition and obtaining measurements of the optical densities of said at least one color patch; obtaining a measurement of the conductivity of said toner composition and comparing said conductivity to a reference; determining the respective amounts of said first and second charge directors which need to be added to said composition to restore said first and second concentrations of first and second charge directors in said toner composition to said respective first and second given values; and adding respective amounts of said first and second charge directors to said composition.
Claim 2
Independent Claim
134 words
A method for maintaining first and second concentrations of respective first and second charge directors at respective given first and second values in a toner composition comprising pigmented particles, said method comprising the following steps: developing at least one color patch using said toner composition and obtaining measurements of the optical densities of said at least one color patch; obtaining a measurement of the conductivity of said toner composition and comparing said conductivity to a reference; determining the respective amounts of said first and second charge directors which need to be added to said composition to restore said first and second concentrations of first and second charge directors in said toner composition to said respective first and second given values; and adding respective amounts of said first and second charge directors to said composition.
Claim 3
Dependent Claim
39 words
A method according to claim 1 and also including the step of removing pigmented particles from a sample of said toner composition and measuring the amount of absorption of light of at least one given wavelength by said sample.
Claim 4
Independent Claim
144 words
A method for maintaining first and second concentrations of respective first and second charge directors at respective given first and second values in a toner composition comprising pigmented particles, said method comprising the following steps: developing at least one color patch using said toner composition and obtaining measurements of the optical densities of said at least one color patch, removing pigmented particles from a sample of said toner composition and measuring the amount of absorption of light of at least one given wavelength by said sample; determining the respective amounts of said first and second charge directors which need to be added to said composition to restore said first and second concentrations of first and second charge directors in said toner composition to said respective first and second given values; and adding respective amounts of said first and second charge directors to said composition.
Claim 5
Independent Claim
144 words
A method for maintaining first and second concentrations of respective first and second charge directors at respective given first and second values in a toner composition comprising pigmented particles, said method comprising the following steps: developing at least one color patch using said toner composition and obtaining measurements of the optical densities of said at least one color patch, removing pigmented particles from a sample of said toner composition and measuring the amount of absorption of light of at least one given wavelength by said sample; determining the respective amounts of said first and second charge directors which need to be added to said composition to restore said first and second concentrations of first and second charge directors in said toner composition to said respective first and second given values; and adding respective amounts of said first and second charge directors to said composition.
Claim 6
Independent Claim
137 words
A method for maintaining first and second concentrations of respective first and second charge directors at respective given first and second values in a toner composition comprising pigmented particles, said method comprising the following steps: obtaining a measurement of the conductivity of said toner composition and comparing said conductivity to a reference, removing pigmented particles from a sample of said toner composition and measuring the amount of absorption of light of at least one given wavelength by said sample; determining the respective amounts of said first and second charge directors which need to be added to said composition to restore said first and second concentrations of first and second charge directors in said toner composition to said respective first and second given values; and adding respective amounts of said first and second charge directors to said composition.
Claim 7
Independent Claim
137 words
A method for maintaining first and second concentrations of respective first and second charge directors at respective given first and second values in a toner composition comprising pigmented particles, said method comprising the following steps: obtaining a measurement of the conductivity of said toner composition and comparing said conductivity to a reference, removing pigmented particles from a sample of said toner composition and measuring the amount of absorption of light of at least one given wavelength by said sample; determining the respective amounts of said first and second charge directors which need to be added to said composition to restore said first and second concentrations of first and second charge directors in said toner composition to said respective first and second given values; and adding respective amounts of said first and second charge directors to said composition.
References Cited (Backward Citations)
US3381662A
Cited
US3793205A
Cited
US4068938A
Cited
US4111151A
Cited
US4264185A
Cited
JPS55124156A
Cited
US4562129A
Cited
US4785327A
Cited
US4947201A
Cited
US5012300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-09 | 1995-12-09 | 1996-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-09 | 1999-12-09 | 2000-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-09 | 2003-12-09 | 2004-06-09 | $7700.00 | Window Closed / Lapsed |