US3092338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulp refining apparatus
Assignee: Valmet AB
•
Filing: 1960-04-15
•
Granted: 1963-06-04
•
Expires: 1980-04-15
Abstract
No abstract record available.
Inventors
- 👤 Reinhall Rolf Bertil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:38
CPC Classifications
D; D21; D21D; D21D1/00; D21D1/20; D21D1/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
144 words
A PULP REFINING APPARATUS COMPRISING, A REFINER HAVING TWO GRINDING MEMBERS ROTATABLE RELATIVELY TO ONE ANOTHER, MEANS FOR INTRODUCING A PRE-CONCENTRATED SUSPENSION BETWEEN THE GRINDING MEMBERS, A PERFORATED TUBE, A ROTATIVE ACRAPER MEMBER WITHIN THE TUBE, SAID TUBE BEING CONNECTED TO THE INLET SIDE OF THE REFINER, A CASING ARRANGED AROUND THE TUBE AND HAVING ITS WALL SPACED FROM THE OUTSIDE OF THE TUBE, SAID CASING COLLECTING FLUID EXPRESSED FROM THE INSIDE OF THE TUBE THROUGH THE PERFORATIONS THEREIN, A PUMP FOR FEEDING THE SUSPENSION UNDER PRESSURE TO THE INTERIOR OF THE TUBE, MEANS AT THE OUTLET END OF THE TUBE AND BETWEEN SAID END AND THE INLET OF THE REFINER, FOR SETTING UP REGULATABLE COUNTER PRESSURE IN THE TUBE, THE CASING HAVING AN OUTLET, AND MEANS OPERATIVE IN THE SAID OUTLET FOR DEVELOPING A COUNTER PRESSURE WITHIN THE CASING AROUND THE PERFORATED TUBE.
References Cited (Backward Citations)
NL68735C
Cited
US783559A
Cited
US837010A
Cited
US1048853A
Cited
US1687446A
Cited
US1689932A
Cited
US1741347A
Cited
US2280880A
Cited
US2903960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-06-03 | 1966-12-03 | 1967-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-03 | 1970-12-03 | 1971-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-03 | 1974-12-03 | 1975-06-04 | $7700.00 | Window Closed / Lapsed |