US2883258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable concentrated naphthol solutions
Assignee: Wyeth Holdings LLC
•
Filing: 1958-05-26
•
Granted: 1959-04-21
•
Expires: 1978-05-26
Abstract
No abstract record available.
Inventors
- 👤 Jr Penn F Spitzer
- 👤 Leslie L Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 23:19
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0079
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A CONCENTRATED SOLUTION OF HYDROXYNAPHTHOIC ANILIDE COMPRISING FROM 35 TO 40 PARTS OF HYDROXYNAPHTHOIC ANILIDE, AT LEAST 1.0 MOL BUT NOT MORE THAN 1.5 MOLS OF AN ALKALI METAL HYDROXIDE PER MOL OF SAID ANILIDE, WATER AND ETHYLENE GLYCOL, ALL IN PROPORTIONS REPRESENTED BY AREAS A TO D ON FIGURES 1 TO 4 OF THE ANNEXED DRAWING, SAID SOLUTION BEING CHARACTERIZED BY THE PROPERTY OF BEING STABLE ON STORAGE.
Claim 2
Dependent Claim
69 words
A CONCENTRATED SOLUTION OF HYDROXYNAPHTHOIC ANILIDE COMPRISING FROM 35 TO 40 PARTS OF HYDROXYNAPHTHOIC ANILIDE, AT LEAST 1.0 MOL BUT NOT MORE THAN 1.5 MOLS OF AN ALKALI METAL HYDROXIDE PER MOL OF SAID ANILIDE, WATER AND ETHYLENE GLYCOL, ALL IN PROPORTIONS REPRESENTED BY AREAS A TO D ON FIGURES 1 TO 4 OF THE ANNEXED DRAWING, SAID SOLUTION BEING CHARACTERIZED BY THE PROPERTY OF BEING STABLE ON STORAGE.
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) | 1962-04-20 | 1962-10-20 | 1963-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-20 | 1966-10-20 | 1967-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-20 | 1970-10-20 | 1971-04-21 | $7700.00 | Window Closed / Lapsed |