US3926337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of measuring concentration ratios of a mixture of materials
Assignee: Continental Can Co Inc
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Filing: 1973-09-17
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Granted: 1975-12-16
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Expires: 1993-09-17
Abstract
Abstract A method of measuring the ratio of carrier particles to toner particles in an electrostatic printing operation is disclosed herein. The method includes the employment of the electrical properties dependent upon the ratio of carrier to toner particles in a carrier-toner mix to determine the suitability of that ratio for an electrostatic printing operation. Variations in magnetic permeability, dielectric permittivity, electrical conductivity or combinations of these three parameters are employed to indicate variations in the ratio of carrier to toner. An electric or magnetic field is established in the area of a quantity of mix and a measurement of one or more of the aforementioned parameters is employed to indicate the need for a greater or lesser percentage of toner or carrier in the mix.
Inventors
- 👤 Roger M O'neill
- 👤 Jr John B Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:21
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/16; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0822; G03G15/0848; G03G15/0849; G03G15/0851; G03G15/0853
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
131 words
An electrostatic printing or coating process involving detecting the ratio of larger carrier particles of a first solid material to smaller toner particles of a second solid material subsequent to completion of a printing or coating operation, wherein said toner particles adhere to said carrier particles by triboelectric forces in a mix of carrier and toner particles, comprising establishing a field in a predetermined position separate and remote from the printing or coating zone, continuously accommodating a predetermined volume of said mix in said position while transporting mix through said position with that of said mix forming said predetermined volume, and detecting the magnitude of said field within said predetermined volume including detecting variations in said field for determining the ratio of carrier particles to toner particles in said predetermined volume.
Claim 2
Dependent Claim
131 words
An electrostatic printing or coating process involving detecting the ratio of larger carrier particles of a first solid material to smaller toner particles of a second solid material subsequent to completion of a printing or coating operation, wherein said toner particles adhere to said carrier particles by triboelectric forces in a mix of carrier and toner particles, comprising establishing a field in a predetermined position separate and remote from the printing or coating zone, continuously accommodating a predetermined volume of said mix in said position while transporting mix through said position with that of said mix forming said predetermined volume, and detecting the magnitude of said field within said predetermined volume including detecting variations in said field for determining the ratio of carrier particles to toner particles in said predetermined volume.
Claim 3
Dependent Claim
47 words
An electrostatic printing or coating process according to claim 6 including the step of adding toner particles to said mix prior to introducing said mix into the printing or coating zone, the addition of toner particles being governed in accordance with data derived from said detecting step.
Claim 4
Dependent Claim
19 words
An electrostatic printing or coating process according to claim 7 wherein said detecting step comprises detecting a magnetic field.
Claim 5
Dependent Claim
39 words
An electrostatic printing or coating process according to claim 1 wherein said step of establishing a field is a step of establishing an electrical field, and said step of detecting comprises the step of detecting variations in dielectric permittivity.
Claim 6
Dependent Claim
38 words
An electrostatic printing or coating process according to claim 1 wherein said step of establishing a field is the step at establishing an electrical field, and said step of detecting comprises the step of detecting variations in conductivity.
Claim 7
Dependent Claim
27 words
The process of claim 1 wherein all of said mix is transported through said position with only a portion of said transported mix forming said predetermined volume.
Claim 8
Dependent Claim
132 words
An electrostatic printing or coating process involving detecting the ratio of larger carrier particles of a first solid material to smaller toner particles of a second solid material which adhere to said carrier particles by triboelectric forces in a mix of carrier and toner particles comprising establishing a field in a predetermined position, accommodating a predetermined volume of said mix in said position while transporting mix through said position, detecting the magnitude of said field within said predetermined volume including detecting variations in said field for determining the ratio of carrier particles to toner particles in said volume, and adding toner particles to said mix prior to introducing said mix into the printing or coating zone, the addition of toner particles being governed in accordance with data derived from said detecting step.
Claim 9
Dependent Claim
132 words
An electrostatic printing or coating process involving detecting the ratio of larger carrier particles of a first solid material to smaller toner particles of a second solid material which adhere to said carrier particles by triboelectric forces in a mix of carrier and toner particles comprising establishing a field in a predetermined position, accommodating a predetermined volume of said mix in said position while transporting mix through said position, detecting the magnitude of said field within said predetermined volume including detecting variations in said field for determining the ratio of carrier particles to toner particles in said volume, and adding toner particles to said mix prior to introducing said mix into the printing or coating zone, the addition of toner particles being governed in accordance with data derived from said detecting step.
Claim 10
Dependent Claim
27 words
The process of claim 7 wherein all of said mix is transported through said position with only a portion of said transported mix forming said predetermined volume.
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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |