Patent US2927693A successfully refreshed from Google Patents.
US2927693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning of paper pulp suspensions
Assignee: Nichols Engineering and Research Corp
•
Filing: 1955-03-10
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Granted: 1960-03-08
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Expires: 1975-03-10
Abstract
No abstract record available.
Inventors
- 👤 Horace Freeman
- 👤 John Douglas Boadway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:53
CPC Classifications
D; D21; D21D; D21D5/00; D21D5/18; B; B04; B04C; B04C5/00; B04C5/08; B04C5/081; B04C5/107; B04C5/14; B04C5/15; B04C5/18; D21F; D21F1/00; D21F1/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2377524A
Cited
US2346005A
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GB607787A
Cited
US2532885A
Cited
US2521103A
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US2757582A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-08 | 1963-09-07 | 1964-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-08 | 1967-09-07 | 1968-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-08 | 1971-09-07 | 1972-03-08 | $7700.00 | Window Closed / Lapsed |