US3276584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulp screen
Assignee: Individual
•
Filing: 1963-10-01
•
Granted: 1966-10-04
•
Expires: 1983-10-01
Abstract
No abstract record available.
Inventors
- 👤 Wilfred F Mathewson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:35
CPC Classifications
D; D21; D21D; D21D5/00; D21D5/02; D21D5/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A PULP SCREEN UNIT FOR SCREEN A FIBROUS PULP STOCK COMPRISING A ROTARY HOLLOW CYLINDRICAL PULP SCREENING ELEMENT HAVING A PLURALITY OF SUBSTANTIALLY EQUALLY SPACED RADIAL SCREEN SLOTS, SAID SLOTS BEING LONGITUDINALLY ELONGATED FOR A SUBSTANTIAL DISTANCE OF THE LONGITUDINAL EXTENSION OF SAID CYLINDRICAL ELEMENT, EACH SLOT HAVING A WIDE ENTRANCE PORTION PROVIDED WITH SUBSTANTIALLY PARALLELE, FLAT OPPOSED SIDE WALLS AND INTO WHICH THE PULP STOCK IS RECEIVED, AN INTERMEDIATE SHOULDER PORTION, AND A RELATIVELY NARROW EXIT SCREENING PORTION HAVING OPPOSED SUBSTANTIALLY PARALLEL, FLAT SIDE WALLS AND FROM WHICH THE SCREENED PULP IS DISCHARGED, THE WALLS OF THE WIDE ENTRANCE PORTION AND THE NARROW EXIT PORTION BEING SUBSTANTIALLY PARALLEL TO EACH OTHER, AND ALL OF SAID WALLS BEING SUBSTANTIALLY SYMMETRICALLY DISPOSED ABOUT A MIDSTREAM CENTER PLANE ON BOTH SIDES THEREOF.
Claim 2
Dependent Claim
130 words
A PULP SCREEN UNIT FOR SCREEN A FIBROUS PULP STOCK COMPRISING A ROTARY HOLLOW CYLINDRICAL PULP SCREENING ELEMENT HAVING A PLURALITY OF SUBSTANTIALLY EQUALLY SPACED RADIAL SCREEN SLOTS, SAID SLOTS BEING LONGITUDINALLY ELONGATED FOR A SUBSTANTIAL DISTANCE OF THE LONGITUDINAL EXTENSION OF SAID CYLINDRICAL ELEMENT, EACH SLOT HAVING A WIDE ENTRANCE PORTION PROVIDED WITH SUBSTANTIALLY PARALLELE, FLAT OPPOSED SIDE WALLS AND INTO WHICH THE PULP STOCK IS RECEIVED, AN INTERMEDIATE SHOULDER PORTION, AND A RELATIVELY NARROW EXIT SCREENING PORTION HAVING OPPOSED SUBSTANTIALLY PARALLEL, FLAT SIDE WALLS AND FROM WHICH THE SCREENED PULP IS DISCHARGED, THE WALLS OF THE WIDE ENTRANCE PORTION AND THE NARROW EXIT PORTION BEING SUBSTANTIALLY PARALLEL TO EACH OTHER, AND ALL OF SAID WALLS BEING SUBSTANTIALLY SYMMETRICALLY DISPOSED ABOUT A MIDSTREAM CENTER PLANE ON BOTH SIDES THEREOF.
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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) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |