Patent US2547307A successfully refreshed from Google Patents.
US2547307A
Expired / Lapsed
US
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Yellow diffusion-fast color formers of the benzimidazole class
Assignee: GAF Chemicals Corp
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Filing: 1950-02-11
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Granted: 1951-04-03
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Expires: 1970-02-11
Abstract
No abstract record available.
Inventors
- 👤 Winfred C Craig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:49
CPC Classifications
C; C07; C07D; C07D235/00; C07D235/02; C07D235/04; C07D235/18; G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/36; G03C7/362
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
COMPOUNDS OF THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
5 words
COMPOUNDS OF THE FOLLOWING FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |