US3633720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alphanumeric printing device employing magnetically positionable particles
Assignee: Honeywell Inc
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Filing: 1969-09-25
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Granted: 1972-01-11
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Expires: 1989-09-25
Abstract
Abstract A printing device is shown that uses a specially adapted paper upon which alphanumeric characters may be printed without impact and from which erroneously printed characters may be removed. The alphanumeric character to be printed is selected by a keyboard which electrically energizes core elements within a recording head. The core elements generate a force field that reorients preoriented highly reflective flakelike particles within the specially adopted paper. The reorientation causes the reflective flakelike particles to become absorbtive for forming a dark contrasting trace upon the paper which represents the selected alphanumeric character. If an error is made, the recording head may be utilized to remove the erroneously selected alphanumeric character by again reorienting the reflective flakes into their previous light-reflective orientation.
Inventors
- 👤 Tommy N Tyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:17
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/385; B41J2/43; Y; Y10; Y10S; Y10S101/00; Y10S101/37; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
260 words
An alphanumeric printer comprising: a supply of force-field-responsive paper; said force-field-responsive paper including reflective, forcefield-responsive, and flakelike particles preorientated in parallel with a plane of said paper for forming a uniform background thereon with respect to incident light; said flakelike particles being magnetic particles; force-field-generating means for generating a magnetic force field in the shape of a predetermined alphanumeric character in juxtaposition with said force-field-responsive paper; keyboard input means connected to said force-field-generating means for selecting said predetermined alphanumeric character; said reflective flakelike particles preorientated on said magnetic force field responsive paper being arranged to reorient in response to said generated magnetic force field for forming a contrasting trace upon said uniform surface of said paper by altering the response of the surface of said paper with respect to the incident light thereon, said contrasting trace taking the form of said selected alphanumeric character; and erasing means for generating a magnetic force field capable of orientating said reorientated reflective flakelike particles back to the first-mentioned preorientated position in the event an error is made in selecting said predetermined alphanumeric character; said erasing means comprising: switching circuit means; means within said keyboard input means for energizing said switching circuit means; erasing head means for generating sensing signals in response to previously recorded alphanumeric characters; means connecting said erasing head means to said switching circuit means for receiving said generated sensing signal within said switching circuit means; and means connecting said switching circuit means to said erasing head means for applying an erasing signal thereto in accordance with said received sensing signals.
Claim 2
Dependent Claim
260 words
An alphanumeric printer comprising: a supply of force-field-responsive paper; said force-field-responsive paper including reflective, forcefield-responsive, and flakelike particles preorientated in parallel with a plane of said paper for forming a uniform background thereon with respect to incident light; said flakelike particles being magnetic particles; force-field-generating means for generating a magnetic force field in the shape of a predetermined alphanumeric character in juxtaposition with said force-field-responsive paper; keyboard input means connected to said force-field-generating means for selecting said predetermined alphanumeric character; said reflective flakelike particles preorientated on said magnetic force field responsive paper being arranged to reorient in response to said generated magnetic force field for forming a contrasting trace upon said uniform surface of said paper by altering the response of the surface of said paper with respect to the incident light thereon, said contrasting trace taking the form of said selected alphanumeric character; and erasing means for generating a magnetic force field capable of orientating said reorientated reflective flakelike particles back to the first-mentioned preorientated position in the event an error is made in selecting said predetermined alphanumeric character; said erasing means comprising: switching circuit means; means within said keyboard input means for energizing said switching circuit means; erasing head means for generating sensing signals in response to previously recorded alphanumeric characters; means connecting said erasing head means to said switching circuit means for receiving said generated sensing signal within said switching circuit means; and means connecting said switching circuit means to said erasing head means for applying an erasing signal thereto in accordance with said received sensing signals.
Claim 3
Dependent Claim
109 words
An alphanumeric printer as claimed in claim 1, additionally comprising: said erasing head means including a pair of erasing heads having a common paper-facing surface arranged on each side of said magnetic-field-generating means; core elements arranged within said erasing heads and exposed on the paper facing surface thereof; said pair of erasing heads sensing a correctly printed alphanumeric character on each side of an incorrectly printed character and generating said sensing signals accordingly; and said switching cIrcuit means applying said erasing signal to said core elements deposed adjacent said correctly printed alphanumeric character for creating a flux pattern through said magnetic-field-responsive paper and erasing said incorrectly printed character therebetween.
Claim 4
Dependent Claim
145 words
An alphanumeric printer as claimed in claim 2, additionally comprising, said magnetic-field-generating means including a recording head having a paper-facing surface thereon; said paper-facing surface of said recording head and said paper-facing surface of said erasing heads angularly disposed to each other; flux-conducting means joining the core elements of said erasing heads opposite the paper-facing surface thereof; said erasing heads having coil means wound upon the core elements thereof to generate a flux in one direction within the first erasing head of said pair and to generate said flux in the other direction within the second erasing head of said pair for passing said flux through said first erasing head, said magnetic-field-responsive paper, said second erasing head, and the through said flux-conducting means thereby orienting said magnetic flakelike particles within said magnetic-field-responsive paper parallel to the plane thereof and erasing any alphanumeric character printed therebetween.
References Cited (Backward Citations)
US25363A
Cited
US2481621A
Cited
US2841461A
Cited
US2844434A
Cited
US3012232A
Cited
US2951121A
Cited
US3221315A
Cited
US3292171A
Cited
US3320523A
Cited
US3443214A
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 |