US2674604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent brighteners
Assignee: GAF Chemicals Corp
•
Filing: 1951-11-15
•
Granted: 1954-04-06
•
Expires: 1971-11-15
Abstract
No abstract record available.
Inventors
- 👤 Hoefle Milton Louis
- 👤 Wynn Robert Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:00
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/78; C07D307/79
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)
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) | 1957-04-05 | 1957-10-05 | 1958-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-05 | 1961-10-05 | 1962-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-05 | 1965-10-05 | 1966-04-06 | $7700.00 | Window Closed / Lapsed |