US3194838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of alpha-hydroxy-beta-alkyl-aminonaphthalene
Assignee: Polaroid Corp
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Filing: 1962-02-19
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Granted: 1965-07-13
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Expires: 1982-02-19
Abstract
No abstract record available.
Inventors
- 👤 Daniel L Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:38
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/08; G03C8/10; G03C8/12; G03C8/14; G03C8/16; G03C8/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
THE PROCESS OF SELECTIVELY REPLACING THE B-HYDROXY GROUP OF 1,7-DIHYDROXYNAPHTHALENE WITH AN ALKYL AMINO GROUP WHICH COMPRISES HEATING IN A BOMB A REACTION MIXTURE CONSISTING ESSENTIALLY OF (A) AN AMINE SELECTED FROM THE GROUP CONSISTING OF PRIMARY AND SECONDARY ALIPHATIC AMINES; (B) 1,7-DIHYDROXYNAPHTHALENE; AND (C) WATER, AND RECOVERING A COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
53 words
THE PROCESS OF SELECTIVELY REPLACING THE B-HYDROXY GROUP OF 1,7-DIHYDROXYNAPHTHALENE WITH AN ALKYL AMINO GROUP WHICH COMPRISES HEATING IN A BOMB A REACTION MIXTURE CONSISTING ESSENTIALLY OF (A) AN AMINE SELECTED FROM THE GROUP CONSISTING OF PRIMARY AND SECONDARY ALIPHATIC AMINES; (B) 1,7-DIHYDROXYNAPHTHALENE; AND (C) WATER, AND RECOVERING A COMPOUND OF THE FORMULA:
References Cited (Backward Citations)
US2733273A
Cited
US2053818A
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US2163639A
Cited
US2572284A
Cited
US2657983A
Cited
US2835635A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-12 | 1969-01-11 | 1969-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-12 | 1973-01-11 | 1973-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-12 | 1977-01-11 | 1977-07-13 | $7700.00 | Window Closed / Lapsed |