US3615749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printing ink of improved blackness
Assignee: Wyeth Holdings LLC
•
Filing: 1970-06-19
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Granted: 1971-10-26
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Expires: 1990-06-19
Abstract
Abstract Carbon black ink compositions of improved blackness result from treating a ferric ammonium ferrocyanide pigment, (iron blue) preferably while still in aqueous dispersion, with a cationic surfactant of the asphalt antistripping type, such as an alkylamidoalkylhydroxyalkyl quaternary ammonium compound, such as stearamidopropyl dimethyl-2-hydroxyethyl ammonium nitrate, and incorporating in the ink to prevent browning.
Inventors
- 👤 John Henry
- 👤 Walter Eldon Ness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:58
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/02; C09D11/03; C09D11/037
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2742375A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |