Patent US3288778A successfully refreshed from Google Patents.
US3288778A
Expired / Lapsed
US
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Azo and anthraquinone dye developers
Assignee: Polaroid Corp
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Filing: 1964-10-05
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Granted: 1966-11-29
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Expires: 1984-10-05
Abstract
No abstract record available.
Inventors
- 👤 Elkan R Blout
- 👤 Saul G Cohen
- 👤 Howard G Rogers
- 👤 Myron S Simon
- 👤 Robert B Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:18
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
32 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ANTHRAQUINONE MONOAZO, AND DISAZO DYES CHARACTERIZED IN THAT THEY CONTAIN ESSENTIALLY NOT LESS THAN ONE AND NOT MORE THAN TWO GROUPS OF THE FORMULA:
Claim 2
Dependent Claim
32 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ANTHRAQUINONE MONOAZO, AND DISAZO DYES CHARACTERIZED IN THAT THEY CONTAIN ESSENTIALLY NOT LESS THAN ONE AND NOT MORE THAN TWO GROUPS OF THE FORMULA:
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) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |