Patent US2889153A successfully refreshed from Google Patents.
Patent US2635535A successfully refreshed from Google Patents.
US2635535A
Expired / Lapsed
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Mordanting
Assignee: EIDP Inc
•
Filing: 1946-01-31
•
Granted: 1953-04-21
•
Expires: 1966-01-31
Abstract
No abstract record available.
Inventors
- 👤 Andrew B Jennings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:44
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/22; G03C7/25; G03C1/00; G03C1/76; G03C1/825
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
THE PROCESS WHICH COMPRISES TREATING A WATER-PERMEABLE COLLOID WITH AN AQUEOUS ALKALINE SOLUTION CONTAINING A NAPHTHOL SULFONAMIDE OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
21 words
THE PROCESS WHICH COMPRISES TREATING A WATER-PERMEABLE COLLOID WITH AN AQUEOUS ALKALINE SOLUTION CONTAINING A NAPHTHOL SULFONAMIDE OF THE GENERAL FORMULA:
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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) | 1956-04-20 | 1956-10-20 | 1957-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-20 | 1960-10-20 | 1961-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-20 | 1964-10-20 | 1965-04-21 | $7700.00 | Window Closed / Lapsed |