Patent US2684908A successfully refreshed from Google Patents.
US2684908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Black hectograph printing ink
Assignee: GAF Chemicals Corp
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Filing: 1950-08-30
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Granted: 1954-07-27
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Expires: 1970-08-30
Abstract
No abstract record available.
Inventors
- 👤 Walter G Drautz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:19
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/025; B41M5/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A BLACK PRINTING INK FOR HECTOGRAPHIC TRANSFER MEDIUM COMPRISING A POLYETHYLENE GLYCOL WAX, ABOUT 45 TO ABOUT 471/2 PARTS OF SPIRIT-SOLUBLE NIGROSINE AND LESSER AMOUNTS OF A BISMARCK BROWN BASE, ABOUT 50 PARTS OF A MIXTURE COMPRISING THE WATER-SOLUBLE DYESTUFF SALTS CHRYSOIDINE, CRYSTAL VOILET AND VICTORIA PURE BLUE AND AT LEAST ONE MEMBER OF THE CLASS CONSISTING OF A METHYL VOILET BASE, A VICTORIA BLUE BASE, AND A CHRYSOIDINE BASE, THE TOTAL AMOUNT OF SAID DYESTUFF BASES BEING ABOUT 21/2 TO ABOUT 5 PARTS.
Claim 2
Dependent Claim
84 words
A BLACK PRINTING INK FOR HECTOGRAPHIC TRANSFER MEDIUM COMPRISING A POLYETHYLENE GLYCOL WAX, ABOUT 45 TO ABOUT 471/2 PARTS OF SPIRIT-SOLUBLE NIGROSINE AND LESSER AMOUNTS OF A BISMARCK BROWN BASE, ABOUT 50 PARTS OF A MIXTURE COMPRISING THE WATER-SOLUBLE DYESTUFF SALTS CHRYSOIDINE, CRYSTAL VOILET AND VICTORIA PURE BLUE AND AT LEAST ONE MEMBER OF THE CLASS CONSISTING OF A METHYL VOILET BASE, A VICTORIA BLUE BASE, AND A CHRYSOIDINE BASE, THE TOTAL AMOUNT OF SAID DYESTUFF BASES BEING ABOUT 21/2 TO ABOUT 5 PARTS.
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) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |