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Patent US2697384A successfully refreshed from Google Patents.
US2697384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing dirt from wood pulp
Assignee: Paper Patents Co
•
Filing: 1950-01-14
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Granted: 1954-12-21
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Expires: 1970-01-14
Abstract
No abstract record available.
Inventors
- 👤 Kenneth A Craig
- 👤 Wet Charl Louis Roux De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:43
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/14; B03D1/1431; B03D1/1443; B03D1/1462; D; D21; D21F; D21F1/00; D21F1/66; D21F1/70
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1312976A
Cited
US864856A
Cited
US1226333A
Cited
GB277310A
Cited
US1988416A
Cited
GB559892A
Cited
US2596015A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |