Patent US3853554A successfully refreshed from Google Patents.
US3853554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for liquid development of electronic photography
Assignee: Canon Inc
•
Filing: 1972-07-19
•
Granted: 1974-12-10
•
Expires: 1992-07-19
Abstract
Abstract A process for developing electrical latent images with a liquid developer containing at least a colouring agent, cyclic rubber and low molecular polyethylene which promote the transferring and fixing of images, and a charge controller which controls the charge of toner, all existing in an electrically insulating liquid medium which process is applicable to the electronic photography and comprises steps of visualizing electrical latent images with the liquid developer and transferring the visualized images to a transfer material.
Inventors
- 👤 I Maki
- 👤 M Kiuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:22
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/06; G03G13/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
95 words
IN A METHOD FOR DEVELOPING ELECTRICAL LATENT IMAGES WHEREIN AN ELECTRICAL IMAGE IS PRODUCED ON A PHOTOELECTROCONDUCTIVE OR AN INSULATING LAYER, A LIQUID DEVELOPER IS APPLIED TO THE LAYER TO VISUALIZE THE IMAGE, AND THEN THE VISUALIZED IMAGE IS TRANSFERRED TO A TRANSFER MATERIAL, THE IMPROVEMENT WHEREIN THE LIQUID DEVELOPER COMPRISES A COLORING AGENT, A CYCLIC RUBBER AND POLYETHYLENE HAVING A MOLECULAR WEIGHT FROM ABOUT 1,000 TO 5,000, SAID COMPONENTS BEING DISPERSED IN AN ELECTRICALLY INSULTAING LIQUID HAVING AN ELECTRICAL RESISTANCE OF MORE THAN 10**10 OHM-CM AND A SPECIFIC DIELECTRIC CONSTANT OF LESS THAN 3.
Claim 2
Dependent Claim
95 words
IN A METHOD FOR DEVELOPING ELECTRICAL LATENT IMAGES WHEREIN AN ELECTRICAL IMAGE IS PRODUCED ON A PHOTOELECTROCONDUCTIVE OR AN INSULATING LAYER, A LIQUID DEVELOPER IS APPLIED TO THE LAYER TO VISUALIZE THE IMAGE, AND THEN THE VISUALIZED IMAGE IS TRANSFERRED TO A TRANSFER MATERIAL, THE IMPROVEMENT WHEREIN THE LIQUID DEVELOPER COMPRISES A COLORING AGENT, A CYCLIC RUBBER AND POLYETHYLENE HAVING A MOLECULAR WEIGHT FROM ABOUT 1,000 TO 5,000, SAID COMPONENTS BEING DISPERSED IN AN ELECTRICALLY INSULTAING LIQUID HAVING AN ELECTRICAL RESISTANCE OF MORE THAN 10**10 OHM-CM AND A SPECIFIC DIELECTRIC CONSTANT OF LESS THAN 3.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein the insulating liquid further contains a phenolic resin dispersed therein.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein the insulating liquid further contains a coumarone resin dispersed therein.
Claim 5
Dependent Claim
32 words
The method of claim 2 wherein the insulating liquid further contains a material selected from the group consisting of lecithin, manganese naphthenate, iron naphthenate, alkyl resin, linseed oil, chlorinated paraffine and bitumen.
Claim 6
Dependent Claim
32 words
The method of claim 3 wherein the insulating liquid further contains a material selected from the group consisting of lecithin, manganese naphthenate, iron naphthenate, alkyl resin, linseed oil, chlorinated paraffine, and bitumen.
Claim 7
Dependent Claim
14 words
The method of claim 1 wherein the insulating liquid further contains lecithin dispersed therein.
Claim 8
Dependent Claim
14 words
The method of claim 3 wherein the insulating liquid further contains lecithin dispersed therein.
Claim 9
Dependent Claim
43 words
The method of claim 1 wherein the liquid developer contains per liter of electrically insulating liquid: 0.2 - 6.0 grams of coloring agent; 0.2 - 6.0 grams of cyclic rubber; 0.1 - 5.0 grams of polyethylene; and 0.005 - 0.1 gram of lecithin.
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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |