Patent US3421657A successfully refreshed from Google Patents.
Patent US3052592A successfully refreshed from Google Patents.
US3052592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulp bleaching
Assignee: Bauer Brothers Co
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Filing: 1958-10-15
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Granted: 1962-09-04
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Expires: 1978-10-15
Abstract
No abstract record available.
Inventors
- 👤 Lee E Eberhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:26
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
56 words
A METHOD OF BLEACHING WOOD PULP INCLUDING THE STEPS OF INTIMATELY MIXING THE PULP AND BLEACH COMPOUND BY DISPERSING THE PULP FROM A MIXING TO A QUENCH CHAMBER AND SIMULTANEOUSLY DISPERSING THE BLEACH OVER THE PULP AS THE PULP IS DISCHARGED FROM THE MIXING CHAMBER, CHANNELING SAID MIXTURE IN A FREE FALL TO THE QUENCH CHAM-
References Cited (Backward Citations)
US1642978A
Cited
US1643566A
Cited
US1753228A
Cited
US1996363A
Cited
US2383684A
Cited
US2361150A
Cited
US2769710A
Cited
US2893909A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-03 | 1966-03-05 | 1966-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-03 | 1970-03-05 | 1970-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-03 | 1974-03-05 | 1974-09-04 | $7700.00 | Window Closed / Lapsed |