Patent US2900219A successfully refreshed from Google Patents.
US2900219A
Expired / Lapsed
US
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Bleaching process by means of chlorites
Assignee: Hoechst AG
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Filing: 1955-09-07
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Granted: 1959-08-18
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Expires: 1975-09-07
Abstract
No abstract record available.
Inventors
- 👤 Waibel Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:25
CPC Classifications
D; D06; D06L; D06L4/00; D06L4/20; D06L4/22; D06L4/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2145062A
Cited
US2100496A
Cited
GB552711A
Cited
GB552567A
Cited
US2521340A
Cited
GB723566A
Cited
BE527711A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |