US3988061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure fixing of toners
Assignee: AB Dick Co
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Filing: 1974-08-01
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Granted: 1976-10-26
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Expires: 1994-08-01
Abstract
Abstract Electroscopic toner powders deposited in an image pattern configuration on a substrate are fixed in place thereon by applying pressure in the absence of heat. This is accomplished by applying pressure in a degree normally insufficient to secure adequate fixing, but by repeating the treatment one or more times, adequate fixing is achieved.
Inventors
- 👤 Russell L. Root
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:09
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2092
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
The method of providing a permanent image on a substrate, wherein the image is a fixed dry powder image of electroscopic toner powder having a predetermined threshold pressure and wherein fixing is achieved solely by the application of pressure applied to the powder image on the substrate, comprising: the steps of creating an electrostatic charge pattern in image configuration; depositing dry electrostatic toner powder upon said substrate to form an image pattern configuration under the electrical control of said charge pattern; and fixing the toner power image to said substrate, wherein the last mentioned step includes: a. applying to said imaged substrate a pressure less than said threshold pressure by means of an unheated pressure member; and b. repeating the procedure of step a) one or more times to ultimately pressure fix said powder image upon said substrate.
Claim 2
Independent Claim
138 words
The method of providing a permanent image on a substrate, wherein the image is a fixed dry powder image of electroscopic toner powder having a predetermined threshold pressure and wherein fixing is achieved solely by the application of pressure applied to the powder image on the substrate, comprising: the steps of creating an electrostatic charge pattern in image configuration; depositing dry electrostatic toner powder upon said substrate to form an image pattern configuration under the electrical control of said charge pattern; and fixing the toner power image to said substrate, wherein the last mentioned step includes: a. applying to said imaged substrate a pressure less than said threshold pressure by means of an unheated pressure member; and b. repeating the procedure of step a) one or more times to ultimately pressure fix said powder image upon said substrate.
Claim 3
Dependent Claim
134 words
Apparatus for providing a permanent image on a substrate, wherein the image is a fixed dry powder image of electroscopic toner powder having a predetermined threshold pressure and wherein fixing is achieved solely by the application of pressure applied to the powder image on the substrate, comprising: means for creating an electrostatic charge pattern in image configuration; means for depositing dry electroscopic toner powder upon said substrate to form an image pattern configuration under the electrical control of said charge pattern; and means for fixing said toner power image to said substrate, wherein said last mentioned means includes: means consisting essentially of unheated pressure members for exposing said imaged substrate to a series of at least two pressure applications in sequence, each such application being at a pressure value less than said threshold pressure.
Claim 4
Dependent Claim
134 words
Apparatus for providing a permanent image on a substrate, wherein the image is a fixed dry powder image of electroscopic toner powder having a predetermined threshold pressure and wherein fixing is achieved solely by the application of pressure applied to the powder image on the substrate, comprising: means for creating an electrostatic charge pattern in image configuration; means for depositing dry electroscopic toner powder upon said substrate to form an image pattern configuration under the electrical control of said charge pattern; and means for fixing said toner power image to said substrate, wherein said last mentioned means includes: means consisting essentially of unheated pressure members for exposing said imaged substrate to a series of at least two pressure applications in sequence, each such application being at a pressure value less than said threshold pressure.
Claim 5
Dependent Claim
33 words
Apparatus as set forth in claim 2 in which said last mentioned means comprises a plurality of pressure member sets arranged in cooperating relationship whereby the substrate passes through each one in turn.
Claim 6
Dependent Claim
36 words
Apparatus as set forth in claim 2 in which said last mentioned means comprises a single set of pressure members, and means for recirculating the substrate to receive a series of pressure treatments by said set.
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) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |