Patent US2723288A successfully refreshed from Google Patents.
US2723288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent agents
Assignee: —
•
Filing: —
•
Granted: 1955-11-08
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Expires: 1972-11-08
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:07
CPC Classifications
C; C07; C07C; C07C39/00; C07C39/205; C07C39/21; C07C39/215; C09; C09K; C09K11/00; C09K11/06
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
US2139471A
Cited
US2202902A
Cited
US2256806A
Cited
FR895847A
Cited
GB596324A
Cited
US2528324A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-07 | 1959-05-09 | 1959-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-07 | 1963-05-09 | 1963-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-07 | 1967-05-09 | 1967-11-08 | $7700.00 | Window Closed / Lapsed |