US3634867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic recorder
Assignee: Honeywell Inc
•
Filing: 1968-10-31
•
Granted: 1972-01-11
•
Expires: 1988-10-31
Abstract
Abstract An electrostatic recorder for recording input signals upon a recording medium having a surface coated with a conductive, electrostatically chargeable material is shown including an electrostatic charging device of the corona discharge type for evenly charging the coated surface of the recording medium. The charged surface is exposed to focused electromagnetic radiation which is transversely displaced across the recording medium for discharging the exposed portion thereof in accordance with the input signal to be recorded. The recording medium is then coated with a suspension fluid containing toner particles applied across the full surface thereof by an applicator arranged as a squeegee. The toner particles are attracted to the electrostatic charge gradient formed between the electrostatically charged surface of the recording medium and the discharged portion thereof.
Inventors
- 👤 Robert G Mcconnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:57
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/326; G03G15/06; G03G15/10; G03G15/101; G03G15/04; G03G15/043; G03G15/0435
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
282 words
An electrostatic recorder for recording an input signal, comprising: a recording web having one surface thereof coated with a metallic oxide capable of being electrostatically charged; electrostatic charging means arranged adjacent said recording web for electrostatically charging said coated surface; a source of electromagnetic energy; means responsive to said input signal for focusing said electromagnetic energy upon said coated surface for removing said electrostatic charge therefrom in response to said input signal thus creating an electrostatic charge gradient between said electrostatically charged portion of said coated surface and the portion of said coated surface from which said electrostatic charge is removed; a liquid suspension containing toner particles, said toner particles being repelled by an electrostatic charge and attracted by an electrostatic charge gradient; and applicator means contacting said recording web across the full coated surface thereof for applying said liquid suspension containing said toner particles to said areas of said electrostatic charge gradient upon said recording web coated surface thus immediately and permanently recording said input signal thereon, said applicator means including a container having an opening covered with a permeable membrane arranged for contacting said recording web across the full width of the coated surface thereof, means for sealing said permeable membrane over said container opening thus retaining said suspension containing toner particles within said container under a partial vacuum, and screen means for supporting said permeable membrane against the urging of said partial vacuum and for forming said permeable membrane against the full width of the coated surface of said recording web, whereby said electrostatic charge gradient upon the coated surface of said recording web draws said toner particles through said permeable membrane against the urging of said partial vacuum.
Claim 2
Dependent Claim
282 words
An electrostatic recorder for recording an input signal, comprising: a recording web having one surface thereof coated with a metallic oxide capable of being electrostatically charged; electrostatic charging means arranged adjacent said recording web for electrostatically charging said coated surface; a source of electromagnetic energy; means responsive to said input signal for focusing said electromagnetic energy upon said coated surface for removing said electrostatic charge therefrom in response to said input signal thus creating an electrostatic charge gradient between said electrostatically charged portion of said coated surface and the portion of said coated surface from which said electrostatic charge is removed; a liquid suspension containing toner particles, said toner particles being repelled by an electrostatic charge and attracted by an electrostatic charge gradient; and applicator means contacting said recording web across the full coated surface thereof for applying said liquid suspension containing said toner particles to said areas of said electrostatic charge gradient upon said recording web coated surface thus immediately and permanently recording said input signal thereon, said applicator means including a container having an opening covered with a permeable membrane arranged for contacting said recording web across the full width of the coated surface thereof, means for sealing said permeable membrane over said container opening thus retaining said suspension containing toner particles within said container under a partial vacuum, and screen means for supporting said permeable membrane against the urging of said partial vacuum and for forming said permeable membrane against the full width of the coated surface of said recording web, whereby said electrostatic charge gradient upon the coated surface of said recording web draws said toner particles through said permeable membrane against the urging of said partial vacuum.
Claim 3
Dependent Claim
255 words
An electrostatic recorder for reCording an input signal, comprising: a recording web having one surface thereof coated with a metallic oxide capable of being electrostatically charged; electrostatic charging means arranged adjacent said recording web for electrostatically charging said coated surface; a source of electromagnetic energy; means responsive to said input signal for focusing said electromagnetic energy upon said coated surface for removing said electrostatic charge therefrom in response to said input signal thus creating an electrostatic charge gradient between said electrostatically charged portion of said coated surface and the portion of said coated surface from which said electrostatic charge is removed; a liquid suspension containing toner particles, said toner particles being repelled by an electrostatic charge and attracted by an electrostatic charge gradient; applicator means contacting said recording web across the full coated surface thereof for applying said liquid suspension containing said toner particles to said areas of said electrostatic charge gradient upon said recording web coated surface thus immediately and permanently recording said input signal thereon; driving means arranged for driving said recording web across said electrostatic charging means at various selectable linear speeds; a second source of electromagnetic energy arranged for preexposing said coated surface of said recording web after it has been electrostatically charged; and means for adjusting said second source of electromagnetic energy as said recording web speed is selectably varied for creating a constant electrostatic charge upon said coated surface of said recording web regardless of the linear speed thereof, thereby creating a constant recording intensity upon said recording web.
Claim 4
Dependent Claim
255 words
An electrostatic recorder for reCording an input signal, comprising: a recording web having one surface thereof coated with a metallic oxide capable of being electrostatically charged; electrostatic charging means arranged adjacent said recording web for electrostatically charging said coated surface; a source of electromagnetic energy; means responsive to said input signal for focusing said electromagnetic energy upon said coated surface for removing said electrostatic charge therefrom in response to said input signal thus creating an electrostatic charge gradient between said electrostatically charged portion of said coated surface and the portion of said coated surface from which said electrostatic charge is removed; a liquid suspension containing toner particles, said toner particles being repelled by an electrostatic charge and attracted by an electrostatic charge gradient; applicator means contacting said recording web across the full coated surface thereof for applying said liquid suspension containing said toner particles to said areas of said electrostatic charge gradient upon said recording web coated surface thus immediately and permanently recording said input signal thereon; driving means arranged for driving said recording web across said electrostatic charging means at various selectable linear speeds; a second source of electromagnetic energy arranged for preexposing said coated surface of said recording web after it has been electrostatically charged; and means for adjusting said second source of electromagnetic energy as said recording web speed is selectably varied for creating a constant electrostatic charge upon said coated surface of said recording web regardless of the linear speed thereof, thereby creating a constant recording intensity upon said recording web.
Claim 5
Dependent Claim
190 words
An electrostatic recorder for recording input information comprising means for moving through said recorder a recording medium having a surface capable of being electrostatically charged, a source of recording energy, means for producing on said surface an electrostatic charge pattern representing said input information and including means for directing energy from said source onto said surface in accordance with said input information and means for subjecting said surface to an electrostatic charging effect for charging said surface, a second source of energy arranged so that its energy is directed onto said surface to reach the latter after it has been subjected to said charging effect for controlling the charge on said surface, means for adjusting said second source of energy in accordance with the speed of movement of said medium for making the charge on said surface constant and independent of said speed, and toner applicator means for applying toner particles to said pattern to produce an immediately visible and permanent trace on said surface representing said input information, said second source of energy and said adjusting means causing the intensity of said trace to be independent of said speed.
Claim 6
Dependent Claim
190 words
An electrostatic recorder for recording input information comprising means for moving through said recorder a recording medium having a surface capable of being electrostatically charged, a source of recording energy, means for producing on said surface an electrostatic charge pattern representing said input information and including means for directing energy from said source onto said surface in accordance with said input information and means for subjecting said surface to an electrostatic charging effect for charging said surface, a second source of energy arranged so that its energy is directed onto said surface to reach the latter after it has been subjected to said charging effect for controlling the charge on said surface, means for adjusting said second source of energy in accordance with the speed of movement of said medium for making the charge on said surface constant and independent of said speed, and toner applicator means for applying toner particles to said pattern to produce an immediately visible and permanent trace on said surface representing said input information, said second source of energy and said adjusting means causing the intensity of said trace to be independent of said speed.
Claim 7
Dependent Claim
268 words
An electrostatic recorder for recording input information comprising means for moving through said recorder a recording medium having a surface capable of being electrostatically charged, a source of recording energy, means for producing on said surface an electrostatic charge pattern representing said input information and including means for directing energy from said source onto said surface in accordance with said input information and means for subjecting said surface to an electrostatic charging effect, toner applicator means comprising a container provided with an opening and a permeable membrane, said membrane having a dimension which is at least equal to the width of said surface and covering and closing said opening to contain within said container a quantity of a liquid toner consisting of a suspension of toner particles within a liquid, said particles being attractable to a charge pattern on said surFace, said opening constituting the only opening into said container and said membrane sealing said container to maintain a partial vacuum in an air space above said liquid toner to regulate the passage thereof through said membrane, and means for mounting said applicator relative to said moving medium with said membrane contacting said surface which bears said charge pattern and extending across the full width of said surface, across the direction of motion thereof, to apply said liquid toner thereto through said membrane by the squeegeeing action of said membrane against said surface as the latter is moved past said membrane by said moving means, thereby to apply said particles to said pattern to produce an immediately visible and permanent trace on said surface representing said input information.
Claim 8
Dependent Claim
268 words
An electrostatic recorder for recording input information comprising means for moving through said recorder a recording medium having a surface capable of being electrostatically charged, a source of recording energy, means for producing on said surface an electrostatic charge pattern representing said input information and including means for directing energy from said source onto said surface in accordance with said input information and means for subjecting said surface to an electrostatic charging effect, toner applicator means comprising a container provided with an opening and a permeable membrane, said membrane having a dimension which is at least equal to the width of said surface and covering and closing said opening to contain within said container a quantity of a liquid toner consisting of a suspension of toner particles within a liquid, said particles being attractable to a charge pattern on said surFace, said opening constituting the only opening into said container and said membrane sealing said container to maintain a partial vacuum in an air space above said liquid toner to regulate the passage thereof through said membrane, and means for mounting said applicator relative to said moving medium with said membrane contacting said surface which bears said charge pattern and extending across the full width of said surface, across the direction of motion thereof, to apply said liquid toner thereto through said membrane by the squeegeeing action of said membrane against said surface as the latter is moved past said membrane by said moving means, thereby to apply said particles to said pattern to produce an immediately visible and permanent trace on said surface representing said input information.
Claim 9
Dependent Claim
45 words
Apparatus as specified in claim 4, wherein said applicator means includes screen means mounted on said container behind said membrane and supporting the latter against the urging of said vacuum for forming said membrane into good contact with said surface across the full width thereof.
Claim 10
Dependent Claim
31 words
An electrostatic recorder as claimed in claim 4, wherein: said permeable membrane is a material selected from the group consisting of felt, wool, or 20 percent polyamide and 80 percent polyester.
References Cited (Backward Citations)
US2885556A
Cited
US2986442A
Cited
US3038799A
Cited
US3133484A
Cited
US3343956A
Cited
US3376133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |