US2694632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digester for cooking cellulose
Assignee: Storviks Sulfit AB
•
Filing: 1948-11-02
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Granted: 1954-11-16
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Expires: 1968-11-02
Abstract
No abstract record available.
Inventors
- 👤 Holge Sigbjorn Paul Ebbinghaus
- 👤 Rudberg Mac Sigurd
- 👤 Rydberg David Rune
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:35
CPC Classifications
D; D21; D21C; D21C7/00; D21C7/04; F; F16; F16L; F16L2101/00; F16L2101/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A DIGESTER FOR COOKING LIGNOCELLULOSIC MATERIAL ADAPTED TO BE SUBJECTED TO SUBATMOSPHERIC PRESSURE COMPRISING AN OUTER RIGID CASING, A RELATIVELY THIN ELASTIC STAINLESS STEEL LINING DISPOSED CONCENTRICALLY ADJACENT THE INNER SURFACE OF THE WALLS OF SAID CASING BUT PROVIDING A SUBSTANTIALLY CONTINUOUS NARROW SPACE THEREBETWEEN, SAID SPACE BEING OF SUBSTANTIALLY THE SAME WIDTH ALONG SUBSTANTIALLY ALL OF THE SURFACE OF SAID LINING SAID BEING SUFFICIENTLY SMALL IN WIDTH ON ALL SIDES OF THE LINING THAT THE ELASTIC LIMIT OF THE STAINLESS STEEL LINING IS NOT EXCEEDED WHEN SAID LINING IS PRESSED FROM ITS NORMAL SPACED POSITION INTO ENGAGEMENT WITH THE SURFACE OF THE WALLS, SAID LINING BEING SUPPORTED BY THE WALL OF THE CASING AND RECEIVING SUPPORT FROM SAID RIGID CASING ON ALL SIDES, A VACUUM PUMP, AND A CONDUIT CONNECTING SAID VACUUM PUMP WITH SAID SPACE.
Claim 2
Dependent Claim
137 words
A DIGESTER FOR COOKING LIGNOCELLULOSIC MATERIAL ADAPTED TO BE SUBJECTED TO SUBATMOSPHERIC PRESSURE COMPRISING AN OUTER RIGID CASING, A RELATIVELY THIN ELASTIC STAINLESS STEEL LINING DISPOSED CONCENTRICALLY ADJACENT THE INNER SURFACE OF THE WALLS OF SAID CASING BUT PROVIDING A SUBSTANTIALLY CONTINUOUS NARROW SPACE THEREBETWEEN, SAID SPACE BEING OF SUBSTANTIALLY THE SAME WIDTH ALONG SUBSTANTIALLY ALL OF THE SURFACE OF SAID LINING SAID BEING SUFFICIENTLY SMALL IN WIDTH ON ALL SIDES OF THE LINING THAT THE ELASTIC LIMIT OF THE STAINLESS STEEL LINING IS NOT EXCEEDED WHEN SAID LINING IS PRESSED FROM ITS NORMAL SPACED POSITION INTO ENGAGEMENT WITH THE SURFACE OF THE WALLS, SAID LINING BEING SUPPORTED BY THE WALL OF THE CASING AND RECEIVING SUPPORT FROM SAID RIGID CASING ON ALL SIDES, A VACUUM PUMP, AND A CONDUIT CONNECTING SAID VACUUM PUMP WITH SAID SPACE.
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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) | 1957-11-15 | 1958-05-17 | 1958-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-15 | 1962-05-17 | 1962-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-15 | 1966-05-17 | 1966-11-16 | $7700.00 | Window Closed / Lapsed |