US2980551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a heat-sensitive copysheet and resultant article
Assignee: 3M Co
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Filing: 1959-02-13
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Granted: 1961-04-18
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Expires: 1979-02-13
Abstract
No abstract record available.
Inventors
- 👤 Donald L Thomsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:31
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/32; Y; Y10; Y10S; Y10S101/00; Y10S101/29; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/165; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249994
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A HEAT-SENSITIVE COPY-SHEET SUITABLE FOR THE THERMOGRAPHIC REPRODUCTION OF GRAPHIC ORIGINALS, CAPABLE OF PERMANENTLY CONVERTING TO A VISIBLY DISTINCT FORM ON BEING MOMENTARILY PRESSED AGAINST A METAL TEST BAR AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 60-150*C., AND INCLUDING A VISIBLY HEAT-SENSITIVE LAYER COMPRISING: A WATER-SOLUBLE COMPOUND OF A CATION AND A DIFFICULTLY REDUCIBLE HETEROPOLY COMPLEX OXYGENATED ANION HAVING A CENTRAL ATOM WITHIN AN ENCLOSING STRUCTURE OF ATOMS SELECTED FROM THE CLASS CONSISTING OF MOLYBDENUM, TUNGSTEN AND VANADIUM, AND MIXTURES THEREOF; A WATER-SOLUBLE HYDROLYZABLE SALT SELECTED FROM THE CLASS CONSISTING OF ALUMINUM CHLORIDE, CALCIUM CHLORIDE, CADMIUM CHLORIDE, LITHIUM CHLORIDE, MAGNESIUM BROMIDE, MAGNESIUM CHLORIDE, MAGNESIUM NITRATE, MAGNESIUM SULFATE, MANGANESE CHLORIDE, MANGANESE SULFATE, NICKEL CHLORIDE, STRONTIUM CHLORIDE, ZINC CHLORIDE, AND ZINC SULFATE; AND A WATERSOLUBLE REDUCING AGENT HAVING AND MILD REDUCING ACTION IN ACID SOLUTION.
Claim 2
Dependent Claim
134 words
A HEAT-SENSITIVE COPY-SHEET SUITABLE FOR THE THERMOGRAPHIC REPRODUCTION OF GRAPHIC ORIGINALS, CAPABLE OF PERMANENTLY CONVERTING TO A VISIBLY DISTINCT FORM ON BEING MOMENTARILY PRESSED AGAINST A METAL TEST BAR AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 60-150*C., AND INCLUDING A VISIBLY HEAT-SENSITIVE LAYER COMPRISING: A WATER-SOLUBLE COMPOUND OF A CATION AND A DIFFICULTLY REDUCIBLE HETEROPOLY COMPLEX OXYGENATED ANION HAVING A CENTRAL ATOM WITHIN AN ENCLOSING STRUCTURE OF ATOMS SELECTED FROM THE CLASS CONSISTING OF MOLYBDENUM, TUNGSTEN AND VANADIUM, AND MIXTURES THEREOF; A WATER-SOLUBLE HYDROLYZABLE SALT SELECTED FROM THE CLASS CONSISTING OF ALUMINUM CHLORIDE, CALCIUM CHLORIDE, CADMIUM CHLORIDE, LITHIUM CHLORIDE, MAGNESIUM BROMIDE, MAGNESIUM CHLORIDE, MAGNESIUM NITRATE, MAGNESIUM SULFATE, MANGANESE CHLORIDE, MANGANESE SULFATE, NICKEL CHLORIDE, STRONTIUM CHLORIDE, ZINC CHLORIDE, AND ZINC SULFATE; AND A WATERSOLUBLE REDUCING AGENT HAVING AND MILD REDUCING ACTION IN ACID SOLUTION.
References Cited (Backward Citations)
US2740896A
Cited
US2663655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |