Patent US2433370A successfully refreshed from Google Patents.
US2433370A
Expired / Lapsed
US
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Method of scouring cellulosic materials
Assignee: BUFFALO ELECTRO CHEM CO
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Filing: 1940-04-24
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Granted: 1947-12-30
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Expires: 1960-04-24
Abstract
No abstract record available.
Inventors
- 👤 Hans O Kauffmann
- 👤 Robert L Mcewen
- 👤 Edward S Shanley
- 👤 John R Hopkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:01
CPC Classifications
D; D06; D06L; D06L1/00; D06L1/12; D06L1/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE289742C
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US333875A
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US396551A
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GB190413867A
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GB351217A
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US2107297A
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US2226162A
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US2267718A
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US2220682A
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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) | 1950-12-29 | 1951-06-30 | 1951-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-29 | 1955-06-30 | 1955-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-29 | 1959-06-30 | 1959-12-30 | $7700.00 | Window Closed / Lapsed |