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Patent US2415779A successfully refreshed from Google Patents.
US2415779A
Expired / Lapsed
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Method of increasing retention of fillers in papermaking
Assignee: California Fruit Growers Exchange
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Filing: 1942-02-16
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Granted: 1947-02-11
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Expires: 1962-02-16
Abstract
No abstract record available.
Inventors
- 👤 Wilson Clarence Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:18
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1105195A
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US1280400A
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US1333255A
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US1838949A
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FR688527A
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US2069766A
Cited
GB477600A
Cited
US2132064A
Cited
GB476778A
Cited
US2293466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-02-10 | 1950-08-12 | 1951-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-02-10 | 1954-08-12 | 1955-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-02-10 | 1958-08-12 | 1959-02-11 | $7700.00 | Window Closed / Lapsed |