US3693183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic printing utilizing thermal gradients
Assignee: Bell and Howell Co
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Filing: 1971-07-19
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Granted: 1972-09-19
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Expires: 1991-07-19
Abstract
Abstract Apparatus for producing optically and magnetically discernible prints of information has an endless magnetic recording medium for providing an erasable magnetic record of the information in response to thermal gradients and an endless transducer medium for providing electrical gradients representative of the information. An electrical energy supply enables the electrical gradients to provide thermal gradients producing the erasable magnetic record. This magnetic record is printed out with a magnetic toning agent and is thereafter erased.
Inventors
- 👤 James U Lemke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:24
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/23; H04N1/27; G; G03; G03G; G03G19/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
169 words
Apparatus for producing optically and magnetically discernible prints of information, comprising in combination: an endless magnetic recording medium for providing an erasable magnetic record of said information in response to thermal gradients representative of said information; endless means operatively associated with said endless magnetic recording medium for providing electrical conductivity paths representative of said information; means supplying electrical energy to said endless means for establishing in said information-representative conductivity paths information-representative electrical gradients generating said information-representative thermal gradients in said magnetic recording medium; means for jointly moving said endless magnetic recording means and said endless means; means operatively associated with said endless means for applying said information to successive portions of said endless means whereby to establish said magnetic record of said information in successive portions of said endless magnetic recording medium; means for applying a magnetic printout agent to said magnetic record to produce a printable pattern manifesting said information; means for printing said pattern on a printout carrier; and means for erasing said magnetic record after printout.
Claim 2
Dependent Claim
169 words
Apparatus for producing optically and magnetically discernible prints of information, comprising in combination: an endless magnetic recording medium for providing an erasable magnetic record of said information in response to thermal gradients representative of said information; endless means operatively associated with said endless magnetic recording medium for providing electrical conductivity paths representative of said information; means supplying electrical energy to said endless means for establishing in said information-representative conductivity paths information-representative electrical gradients generating said information-representative thermal gradients in said magnetic recording medium; means for jointly moving said endless magnetic recording means and said endless means; means operatively associated with said endless means for applying said information to successive portions of said endless means whereby to establish said magnetic record of said information in successive portions of said endless magnetic recording medium; means for applying a magnetic printout agent to said magnetic record to produce a printable pattern manifesting said information; means for printing said pattern on a printout carrier; and means for erasing said magnetic record after printout.
Claim 3
Dependent Claim
29 words
Apparatus as claimed in claim 1, wherein: said magnetic printout agent includes fusible material; and said apparatus includes means for fusing said magnetic printout agent to said printout carrier.
Claim 4
Dependent Claim
58 words
Apparatus as claimed in claimed in claim 1, wherein: said magnetic printout agent includes particles of material attracted by magnetic fields, and shells of a fusible material enclosing said particles; and said apparatus includes means for fusing said shells to said printoUt carrier and for fusing adjacent ones of said shells on said printout carrier to each other.
Claim 5
Dependent Claim
172 words
Apparatus for producing a visually and magnetically discernible oscillograph trace of a varying input signal, comprising in combination: a rotatable drum; an endless magnetic recording medium on said drum for providing an erasable magnetic trace in response to thermal gradients; transducing means on said drum for providing electrical conductivity paths in response to radiant energy; means supplying electrical energy to said transducing means on said drum for establishing in said conductivity paths electrical gradients generating said thermal gradients in said magnetic recording medium; means for projecting a beam of said radiant energy onto said transducing means on said drum; means coupled to said drum for rotating said drum relative to said beam of radiant energy; means for laterally deflecting said beam of radiant energy in response to said varying input signal whereby to provide in said endless magnetic recording medium an erasable magnetic trace representative of said varying input signal; means for printing out said magnetic trace with a magnetic printout agent; and means for erasing said magnetic trace after printout thereof.
Claim 6
Dependent Claim
172 words
Apparatus for producing a visually and magnetically discernible oscillograph trace of a varying input signal, comprising in combination: a rotatable drum; an endless magnetic recording medium on said drum for providing an erasable magnetic trace in response to thermal gradients; transducing means on said drum for providing electrical conductivity paths in response to radiant energy; means supplying electrical energy to said transducing means on said drum for establishing in said conductivity paths electrical gradients generating said thermal gradients in said magnetic recording medium; means for projecting a beam of said radiant energy onto said transducing means on said drum; means coupled to said drum for rotating said drum relative to said beam of radiant energy; means for laterally deflecting said beam of radiant energy in response to said varying input signal whereby to provide in said endless magnetic recording medium an erasable magnetic trace representative of said varying input signal; means for printing out said magnetic trace with a magnetic printout agent; and means for erasing said magnetic trace after printout thereof.
Claim 7
Dependent Claim
29 words
Apparatus as claimed in claim 4, wherein: said beam is a beam of light; and said transducing means include means for providing electrical conductivity paths in response to light.
Claim 8
Dependent Claim
127 words
Apparatus for producing prints of information, comprising in combination: means for providing a magnetic field; endless means for providing electrical conductivity paths representative of said information; an endless magnetic recording medium in at least thermal contact with said endless means for providing an erasable magnetic record of said information in response to said magnetic field and thermal gradients representative of said information; means for moving said endless means and endless magnetic recording medium relative to said means for providing said magnetic field to expose successive portions of said endless magnetic recording medium to said magnetic field; means for supplying electrical energy to said conductivity paths to establish said thermal gradients; means for printing out said magnetic record; and means for erasing said magnetic record after printout thereof.
Claim 9
Dependent Claim
127 words
Apparatus for producing prints of information, comprising in combination: means for providing a magnetic field; endless means for providing electrical conductivity paths representative of said information; an endless magnetic recording medium in at least thermal contact with said endless means for providing an erasable magnetic record of said information in response to said magnetic field and thermal gradients representative of said information; means for moving said endless means and endless magnetic recording medium relative to said means for providing said magnetic field to expose successive portions of said endless magnetic recording medium to said magnetic field; means for supplying electrical energy to said conductivity paths to establish said thermal gradients; means for printing out said magnetic record; and means for erasing said magnetic record after printout thereof.
Claim 10
Dependent Claim
32 words
Apparatus as claimed in claim 6, wherein: said means for providing a magnetic field include means for providing an alternating magnetic field whereby to provide said magnetic record with alternating magnetic gradients.
Claim 11
Dependent Claim
164 words
Apparatus for producing an oscillograph trace of a varying input signal, comprising in combination: means for providing a magnetic field; means for providing a beam of radiant energy; means for deflecting said beam of radiant energy in response to said varying input signal; a rotatably drum; means on said drum for providing electrical conductivity paths corresponding to said deflections of said beam of radiant energy; an endless magnetic recording medium on said drum in at least thermal contact with said conductivity paths providing means for providing an erasable magnetic oscillograph trace in response to said magnetic field and thermal gradients representative of said deflections; means for rotating said drum relative to said means for providing said magnetic field to expose successive portions of said magnetic recording medium to said magnetic field; means for supplying electrical energy to said conductivity paths to establish said thermal gradients; means for printing out said magnetic oscillograph trace; and means for erasing said magnetic oscillograph trace after printout thereof.
Claim 12
Dependent Claim
164 words
Apparatus for producing an oscillograph trace of a varying input signal, comprising in combination: means for providing a magnetic field; means for providing a beam of radiant energy; means for deflecting said beam of radiant energy in response to said varying input signal; a rotatably drum; means on said drum for providing electrical conductivity paths corresponding to said deflections of said beam of radiant energy; an endless magnetic recording medium on said drum in at least thermal contact with said conductivity paths providing means for providing an erasable magnetic oscillograph trace in response to said magnetic field and thermal gradients representative of said deflections; means for rotating said drum relative to said means for providing said magnetic field to expose successive portions of said magnetic recording medium to said magnetic field; means for supplying electrical energy to said conductivity paths to establish said thermal gradients; means for printing out said magnetic oscillograph trace; and means for erasing said magnetic oscillograph trace after printout thereof.
Claim 13
Dependent Claim
33 words
Apparatus as claimed in claim 8, wherein: said means for providing a magnetic field include means for providing an alternating magnetic field whereby to provide said magnetic oscillograph trace with alternatinG magnetic gradients.
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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |