Patent US2676982A successfully refreshed from Google Patents.
US2676982A
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Fluorescent agents
Assignee: GAF Chemicals Corp
•
Filing: 1951-06-08
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Granted: 1954-04-27
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Expires: 1971-06-08
Abstract
No abstract record available.
Inventors
- 👤 Freyermuth Harlan Benjamin
- 👤 Libby William Harris
- 👤 William W Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:25
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/28; C07C309/45; C07C309/51
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
FLUORESCENT AGENTS SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS OF THE FORMULA
Claim 2
Dependent Claim
12 words
FLUORESCENT AGENTS SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS OF THE FORMULA
References Cited (Backward Citations)
US2521665A
Cited
US2581057A
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US2468431A
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US2581059A
Cited
US2527427A
Cited
US2563354A
Cited
US2589519A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |