Patent US2555474A successfully refreshed from Google Patents.
US2555474A
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Assignee: Individual
•
Filing: 1948-06-04
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Granted: 1951-06-05
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Expires: 1968-06-04
Abstract
No abstract record available.
Inventors
- 👤 Vries John De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:47
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A WRITING FLUID CONSISTING OF A MIXTURE OF AQUEOUS SOLUTIONS OF AN ANILINE DYE, COBALTOUS CHLORIDE, AND BENZIDINE DIHYDROCHLORIDE.
Claim 2
Dependent Claim
19 words
A WRITING FLUID CONSISTING OF A MIXTURE OF AQUEOUS SOLUTIONS OF AN ANILINE DYE, COBALTOUS CHLORIDE, AND BENZIDINE DIHYDROCHLORIDE.
References Cited (Backward Citations)
US46684A
Cited
US650901A
Cited
US1172414A
Cited
GB232246A
Cited
US1972395A
Cited
US2200069A
Cited
US2313592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-04 | 1954-12-04 | 1955-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-04 | 1958-12-04 | 1959-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-04 | 1962-12-04 | 1963-06-05 | $7700.00 | Window Closed / Lapsed |