US2493724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quick-drying writing inks
Assignee: GAF Chemicals Corp
•
Filing: 1945-07-11
•
Granted: 1950-01-03
•
Expires: 1965-07-11
Abstract
No abstract record available.
Inventors
- 👤 Mayhew Raymond Lemuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:30
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16; C09D11/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A QUICK-DRYING WRITING INK COMPRISING IN SOLUTION A COPPER PHTHALOCYANINE OF THE BENZENE SERIES HAVING ATTACHED TO THE PHENYLENE NUCLEI A PLURALITY OF ALIPHATIC SULFONAMIDE GROUPS, A HYGROSCOPIC POLYHYDRIC ALCOHOL, WATER AND CAUSTIC ALKALI, THE CONTENT OF CAUSTIC ALKALI IN THE INK BEING EQUIVALENT TO FROM ABOUT 0.5-2% OF SODIUM HYDROXIDE.
Claim 2
Dependent Claim
51 words
A QUICK-DRYING WRITING INK COMPRISING IN SOLUTION A COPPER PHTHALOCYANINE OF THE BENZENE SERIES HAVING ATTACHED TO THE PHENYLENE NUCLEI A PLURALITY OF ALIPHATIC SULFONAMIDE GROUPS, A HYGROSCOPIC POLYHYDRIC ALCOHOL, WATER AND CAUSTIC ALKALI, THE CONTENT OF CAUSTIC ALKALI IN THE INK BEING EQUIVALENT TO FROM ABOUT 0.5-2% OF SODIUM HYDROXIDE.
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) | 1953-01-02 | 1953-07-04 | 1954-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-02 | 1957-07-04 | 1958-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-02 | 1961-07-04 | 1962-01-03 | $7700.00 | Window Closed / Lapsed |