US3455837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of optically brightened synthetic materials
Assignee: BASF Schweiz AG
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Filing: 1965-10-18
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Granted: 1969-07-15
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Expires: 1985-10-18
Abstract
No abstract record available.
Inventors
- 👤 Erwin Maeder
- 👤 Peter Liechti
- 👤 Leonardo Guglielmetti
- 👤 Adolf Emil Siegrist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:35
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/52; C07D263/62; C07D263/64
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-14 | 1973-01-13 | 1973-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-14 | 1977-01-13 | 1977-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-14 | 1981-01-13 | 1981-07-15 | $7700.00 | Window Closed / Lapsed |