Patent US2537138A successfully refreshed from Google Patents.
US2537138A
Expired / Lapsed
US
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Phenolic color formers
Assignee: EIDP Inc
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Filing: 1945-10-08
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Granted: 1951-01-09
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Expires: 1965-10-08
Abstract
No abstract record available.
Inventors
- 👤 Jennings Andrew Bradshaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:27
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/327; C; C08; C08G; C08G14/00; C08G14/02; C08G14/04; C08G14/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
THE PROCESS WHICH COMPRISES REACTING TWO COMPOUNDS IN SUBSTANTIALLY EQUIMOLECULAR PROPORTIONS, NAMELY, A MONOHYDRIC PHENOL TAKEN FROM THE GROUP CONSISTING OF ALPHA-NAPHTHOL-5-SULHYDROXYDIPHENYL, THYMOL, 1 - NAPHTHOL -5-SULPHONIC ACID, M-CRESOL, 2-4-DICHLORONAPHTHOL, XYLENOL, AND 2,6-DIBROMOPHENOL WITH A COMPOUND OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
40 words
THE PROCESS WHICH COMPRISES REACTING TWO COMPOUNDS IN SUBSTANTIALLY EQUIMOLECULAR PROPORTIONS, NAMELY, A MONOHYDRIC PHENOL TAKEN FROM THE GROUP CONSISTING OF ALPHA-NAPHTHOL-5-SULHYDROXYDIPHENYL, THYMOL, 1 - NAPHTHOL -5-SULPHONIC ACID, M-CRESOL, 2-4-DICHLORONAPHTHOL, XYLENOL, AND 2,6-DIBROMOPHENOL WITH A COMPOUND OF THE GENERAL FORMULA:
References Cited (Backward Citations)
US1699245A
Cited
US2050557A
Cited
US2042023A
Cited
US2184303A
Cited
US2330291A
Cited
US2350138A
Cited
US2376679A
Cited
US2374648A
Cited
US2430950A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |