US2658064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent agents from diamino stilbene
Assignee: GAF Chemicals Corp
•
Filing: 1950-08-10
•
Granted: 1953-11-03
•
Expires: 1970-08-10
Abstract
No abstract record available.
Inventors
- 👤 Wallace William Eldred
- 👤 Williams William Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:54
CPC Classifications
C; C07; C07D; C07D401/00; C07D401/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
13 words
FLUORESCENT AGENTS WHICH IN THE FORM OF THE FREE ACID HAVE 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) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |