US3560485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Delta 2-pyrazoline optical brighteners
Assignee: Hoechst AG
•
Filing: 1967-09-29
•
Granted: 1971-02-02
•
Expires: 1987-09-29
Abstract
Abstract NOVEL OPTICAL BRIGHTENING AGENTS FOR THE TREATMENT OF FIBROUS MATERIALS AND FILMS, PROCESSES FOR THEIR USE AND DETERGENT COMPOSITIONS CONTAINING THEM.
Inventors
- 👤 Erich Schinzel
- 👤 Siegfried Bildstein
- 👤 Karl Heinz Lebkucher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:27
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/02; C07D231/06; D; D06; D06L; D06L4/00; D06L4/60; D06L4/657
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |