Patent US6415230B1 successfully refreshed from Google Patents.
Patent US4868773A successfully refreshed from Google Patents.
Patent US3938993A successfully refreshed from Google Patents.
US3938993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xerographic method for making a responsive answer system
Assignee: Xerox Corp
•
Filing: 1973-11-27
•
Granted: 1976-02-17
•
Expires: 1993-11-27
Abstract
Abstract Permanent, meaningful information is so associated with removable, confusing information, at least some of which is usually similar in character to said permanent, meaningful information, as to make it effectively impossible for an observer to discriminate between the two types of information even though both types of information in the association may be legible. Such a system is advantageously used in instructional systems and particularly in responsive answer formats.
Inventors
- 👤 Stephen F. Royka
- 👤 Robert G. Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:28
CPC Classifications
G; G09; G09B; G09B3/00; G09B3/06; G09B3/08; G09B3/085; G03; G03G; G03G15/00; G03G15/22; G06; G06K; G06K17/00; G06K17/0032
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
125 words
A xerographic method for making a device for selectively indicating information characterized by having simultaneously legible meaningful permanent information and legible confusing removable information displayed on a surface within a response area, said method comprising the steps of: a. printing said legible meaningful permanent information on said surface within said response area; and b. xerographically printing said legible confusing removable information on said surface within said response area by forming a latent electrostatic image, corresponding to said legible confusing removable information, on a xerographic plate, developing said latent image with toner, transferring at least part of said toner image to said surface, and fixing said toner image to said surface, said fixing being to a greater than class 1 but less than class 3 fix.
Claim 2
Dependent Claim
125 words
A xerographic method for making a device for selectively indicating information characterized by having simultaneously legible meaningful permanent information and legible confusing removable information displayed on a surface within a response area, said method comprising the steps of: a. printing said legible meaningful permanent information on said surface within said response area; and b. xerographically printing said legible confusing removable information on said surface within said response area by forming a latent electrostatic image, corresponding to said legible confusing removable information, on a xerographic plate, developing said latent image with toner, transferring at least part of said toner image to said surface, and fixing said toner image to said surface, said fixing being to a greater than class 1 but less than class 3 fix.
Claim 3
Dependent Claim
105 words
A xerographic method according to claim 1 wherein said permanent information is xerographically printed on said surface by forming a latent electrostatic image, corresponding to said permanent information, on a xerographic plate; developing said latent image with toner, transferring at least part of said toner image to said surface and fixing said toner image to said surface by passing said surface between pressure rollers at least one of which is heated, the roller contacting the toner bearing side of said surface being provided, on the roller surface, with a film comprising a liquid toner release agent, at least some of which transfers to said surface.
Claim 4
Dependent Claim
16 words
A xerographic method according to claim 2 wherein said liquid toner release agent is silicone oil.
Claim 5
Dependent Claim
37 words
A xerographic method according to claim 3 wherein said silicone oil is dispensed at a rate of between from about 0.0017 to about 0.024 milliliters per square foot of surface contacted by said silicone oil bearing roller.
Claim 6
Dependent Claim
27 words
A xerographic method according to claim 4 wherein said roller contacting the toner bearing side of said surface is surface layered with a toner offset preventing material.
Claim 7
Dependent Claim
16 words
A xerographic method according to claim 5 wherein said offset preventing material is a tetrafluorethylene fluorocarbon.
References Cited (Backward Citations)
US356695A
Cited
US3055117A
Cited
US3130064A
Cited
US3411932A
Cited
US3291466A
Cited
US3364857A
Cited
US3390634A
Cited
US3519253A
Cited
US3788873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |