Patent US3436302A successfully refreshed from Google Patents.
US3436302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of bleaching groundwood pulp web with acid
Assignee: Dow Chemical Co
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Filing: 1965-09-02
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Granted: 1969-04-01
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Expires: 1985-09-02
Abstract
No abstract record available.
Inventors
- 👤 Herman R Goodwald
- 👤 Dale L Schechter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:12
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/1026
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-31 | 1972-09-30 | 1973-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-31 | 1976-09-30 | 1977-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-31 | 1980-09-30 | 1981-04-01 | $7700.00 | Window Closed / Lapsed |