US3427307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Benzoxazole optical brighteners
Assignee: Hoechst AG
•
Filing: 1965-10-13
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Granted: 1969-02-11
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Expires: 1985-10-13
Abstract
No abstract record available.
Inventors
- 👤 Erich Schinzel
- 👤 Ulrich Pintschovius
- 👤 Karl Heinz Lebkucher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:04
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/52; C07D263/54; C07D263/56; C07D263/60; D; D06; D06L; D06L4/00; D06L4/60; D06L4/614; D06L4/636
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3262929A
Cited
BE633434A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |