Patent US2949409A successfully refreshed from Google Patents.
US2949409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic recording media
Assignee: Muirhead and Co Ltd
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Filing: 1957-07-16
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Granted: 1960-08-16
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Expires: 1977-07-16
Abstract
No abstract record available.
Inventors
- 👤 Richards Robert Doughty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:52
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/20; B41M5/205
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
AN ELECTROLYTIC RECORDING MEDIUM FOR FACSIMILE OR PHOTO-TELEGRAPHIC RECEIVERS COMPRISING A BASE IMPREGNATED WITH AN AQUEOUS SOLUTION CONTAINING A POLYHYDROXYPHENOLIC COMPOUND WHICH IS WATER-SOLUBLE, SUBSTANTIALLY COLOURLESS IN WEAK SOLUTION AND CAPABLE OF FORMING A DARK-COLOURED WATER-INSOLUBLE LAKE WITH AN APPROPRIATE METAL, TOGETHER WITH AN ELECTROLYTE, SODIUM CHLORATE TO DEEPED THE COLOUR OF THE RECORDING AND MORE THAN 1% OF SOLUTION WEIGHT OF SODIUM SULPHATE COMPOUND TO PROMOTE RAPID DRYING OF THE MEDIUM AFTER RECORDING.
Claim 2
Dependent Claim
74 words
AN ELECTROLYTIC RECORDING MEDIUM FOR FACSIMILE OR PHOTO-TELEGRAPHIC RECEIVERS COMPRISING A BASE IMPREGNATED WITH AN AQUEOUS SOLUTION CONTAINING A POLYHYDROXYPHENOLIC COMPOUND WHICH IS WATER-SOLUBLE, SUBSTANTIALLY COLOURLESS IN WEAK SOLUTION AND CAPABLE OF FORMING A DARK-COLOURED WATER-INSOLUBLE LAKE WITH AN APPROPRIATE METAL, TOGETHER WITH AN ELECTROLYTE, SODIUM CHLORATE TO DEEPED THE COLOUR OF THE RECORDING AND MORE THAN 1% OF SOLUTION WEIGHT OF SODIUM SULPHATE COMPOUND TO PROMOTE RAPID DRYING OF THE MEDIUM AFTER RECORDING.
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) | 1963-08-16 | 1964-02-15 | 1964-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-16 | 1968-02-15 | 1968-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-16 | 1972-02-15 | 1972-08-16 | $7700.00 | Window Closed / Lapsed |