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US3094619A Expired / Lapsed US ⏱️ 0.0 years remaining

Ultra-violet radiation-desensitizable thermographic copy-sheet and method

Assignee: 3M Co
•
Filing: 1961-01-03
•
Granted: 1963-06-18
•
Expires: 1981-01-03
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Abstract

Abstract 997, 362. Thermographic copying material and process. MINNESOTA MINING & MANUFACTURING CO. Jan. 3,1962 [Jan. 3,1961], No. 10700/65. Divided out of 997,361. Heading G2C. A copy sheet or copysheet combination, which forms a visible image when heated but can be desensitized by exposure to ultra-violet radiation, contains (1) a normally solid organic salt of nickel, cobalt or copper and (2) N, N<SP>1</SP>-bis-furfuryl-dithiooxamide or N, N<SP>1</SP>-bis-carboxyamyl-dithiooxamide. Copies may be made by placing an original in contact with the copy sheet or combination, irradiating with infra-red while in contact, and subsequently desensitizing the copy by exposure to ultraviolet, or by exposing a copy sheet to ultra-violet through a transparent original bearing opaque markings, and subsequently heating to develop colour in the areas not so desensitized. The two reagents may be disposed in a single layer, in separate layers on a single carrier, or in separate layers on separate carriers. The reagent (1) may be nickel stearate or behenate. The reagents may be dispersed in a thin film of a resinous or polymeric film-forming binder in the form of a self-sustaining film, or as a coating on a backing of film, paper or the like. The Specification includes a list of suitable binders. The sheets may also include pigments, fillers, plasticizers, dyes, waxes and resins.

Inventors

  • 👤 Jr Edwin A Grant

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-24 14:48
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/4989; B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/32

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 117 words
A HEAT-SENSITIVE COPY-SHEET CAPABLE OF UNDERGOING PERMANENT VISIBLE CHANGE ON BEING MOMENTARILY HEATED TO A CONVERSION TEMPERATURE WITHIN THE RANGE OF ABOUT 90* C. TO ABOUT 150* C. AND OF BEING MADE INSENSITIVE TO SUCH HEATING ON MODERATE EXPOSURE TO NEAR-ULTRAVIOLET RADIATION, SAID COPY-SHEET INCLUDING A VISIBLY HEAT-SENSITIVE LAYER CONTAINING, IN PHYSICALLY DISTINCT AND CHEMICALLY INTER-REACTIVE RELATIONSHIP, CHEMICALLY INTER-REACTANT COMPONENTS CONSISTING ESSENTIALLY OF (1) A NORMALLY SOLID ORGANIC ACID SALT OF A NOBLE METAL AND, AS AN ORGANIC REDUCING AGENT FOR THE NOBLE METAL ION. (2) AN ALPHA NAPHTHOL HAVING ATTACHED DIRECTLY TO THE HYDROXY-SUBSTITUTED AROMATIC RING A PREPONDERANCE OF ELECTRON DONOR GROUPS SELECTED FROM THE CLASS CONSISTING OF ALKYL, ARYL, ALKOXY, ARYLOXY, HYDROXY AND AMINO GROUPS.
Claim 2
Dependent Claim 117 words
A HEAT-SENSITIVE COPY-SHEET CAPABLE OF UNDERGOING PERMANENT VISIBLE CHANGE ON BEING MOMENTARILY HEATED TO A CONVERSION TEMPERATURE WITHIN THE RANGE OF ABOUT 90* C. TO ABOUT 150* C. AND OF BEING MADE INSENSITIVE TO SUCH HEATING ON MODERATE EXPOSURE TO NEAR-ULTRAVIOLET RADIATION, SAID COPY-SHEET INCLUDING A VISIBLY HEAT-SENSITIVE LAYER CONTAINING, IN PHYSICALLY DISTINCT AND CHEMICALLY INTER-REACTIVE RELATIONSHIP, CHEMICALLY INTER-REACTANT COMPONENTS CONSISTING ESSENTIALLY OF (1) A NORMALLY SOLID ORGANIC ACID SALT OF A NOBLE METAL AND, AS AN ORGANIC REDUCING AGENT FOR THE NOBLE METAL ION. (2) AN ALPHA NAPHTHOL HAVING ATTACHED DIRECTLY TO THE HYDROXY-SUBSTITUTED AROMATIC RING A PREPONDERANCE OF ELECTRON DONOR GROUPS SELECTED FROM THE CLASS CONSISTING OF ALKYL, ARYL, ALKOXY, ARYLOXY, HYDROXY AND AMINO GROUPS.
Claim 3
Dependent Claim 132 words
METHOD OF COPYING COMPRISING: PLACING IN SURFACE CONTACT AND IN POSITION FOR IRRADIATION A GRAPHIC ORGINAL HAVING DIFFERENTIALLY INGRA-RED-AB ORPTIVE IMAGE AND BACKGROUND AREAS AND A HEAT-SENSITIVE COPY-SHEET HAVING A VISIBLY HEAT-SENSITIVE LAYER CONTAINING, IN PHYSICALLY DISTINCT AND CHEMICALLY INTER-REACTIVE RELATIONSHIP, CHEMICALLY INTER-REACTIVE COMPONENTS CONSISTING ESSENTIALLY OF A NORMALLY SOLID SILVER SALT OF AN ORGANIC ACID AND AN ALPHANAPHTHOL HAVING DIRECTLY ATTACHED TO THE HYDROXY-SUBSTITUTED AROMATIC RING A PREPONDERANCE OF ELECTRON DONOE GROUPS SELECTED FROM THE CLASS CONSISTING OF ALKYL, ARYL, ALKOXY, ARYLOXY, HYDROXY AND AMINO GROUPS; MOMENTARILY IRRADIATING SAID GRAPHIC ORIGINAL WITH INTENSE RADIATION RICH IN INFRA-RED FOR PROMOTING VISIBLE REACTION IN SAID LAYER AT SELECTIVELY HEATED IMAGE-DEFINING AREAS; AND THEN IRRADIATING SAID LAYER WITH RADIATION IN THE NEAR-ULTRAVIOLET WAVELENGTH RANGE FOR RENDERING THE BACKGROUND AREAS VISIBLY INSENSITIVE TO SUBSEQUENT HEATING.
Claim 4
Dependent Claim 132 words
METHOD OF COPYING COMPRISING: PLACING IN SURFACE CONTACT AND IN POSITION FOR IRRADIATION A GRAPHIC ORGINAL HAVING DIFFERENTIALLY INGRA-RED-AB ORPTIVE IMAGE AND BACKGROUND AREAS AND A HEAT-SENSITIVE COPY-SHEET HAVING A VISIBLY HEAT-SENSITIVE LAYER CONTAINING, IN PHYSICALLY DISTINCT AND CHEMICALLY INTER-REACTIVE RELATIONSHIP, CHEMICALLY INTER-REACTIVE COMPONENTS CONSISTING ESSENTIALLY OF A NORMALLY SOLID SILVER SALT OF AN ORGANIC ACID AND AN ALPHANAPHTHOL HAVING DIRECTLY ATTACHED TO THE HYDROXY-SUBSTITUTED AROMATIC RING A PREPONDERANCE OF ELECTRON DONOE GROUPS SELECTED FROM THE CLASS CONSISTING OF ALKYL, ARYL, ALKOXY, ARYLOXY, HYDROXY AND AMINO GROUPS; MOMENTARILY IRRADIATING SAID GRAPHIC ORIGINAL WITH INTENSE RADIATION RICH IN INFRA-RED FOR PROMOTING VISIBLE REACTION IN SAID LAYER AT SELECTIVELY HEATED IMAGE-DEFINING AREAS; AND THEN IRRADIATING SAID LAYER WITH RADIATION IN THE NEAR-ULTRAVIOLET WAVELENGTH RANGE FOR RENDERING THE BACKGROUND AREAS VISIBLY INSENSITIVE TO SUBSEQUENT HEATING.

References Cited (Backward Citations)

US2482815A Cited
US2910377A Cited
US2877167A Cited
US2936276A Cited
US2967785A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1966-06-17 1966-12-17 1967-06-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1970-06-17 1970-12-17 1971-06-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1974-06-17 1974-12-17 1975-06-18 $7700.00 Window Closed / Lapsed

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