Patent US2542801A successfully refreshed from Google Patents.
US2542801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous digestion apparatus for the production of highly purified cellulose
Assignee: Individual
•
Filing: 1945-04-12
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Granted: 1951-02-20
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Expires: 1965-04-12
Abstract
No abstract record available.
Inventors
- 👤 Joaquin J De La Roza Sr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:43
CPC Classifications
D; D21; D21C; D21C7/00; Y; Y10; Y10S; Y10S162/00; Y10S162/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
APPARATUS FOR TREATING CELLULOSIC MATERIAL, COMPRISING A PAIR OF DIGESTERS EACH HAVING AN INLET AND AN OUTLET, MEANS SUPPLYING THE MATERIAL TO BE TREATED CONTINUOUSLY TO THE INLET OF ONE DIGESTER, AT LEAST TWO PRESSES CONNECTED IN TANDEM BETWEEN THE OUTLET OF SAID ONE DIGESTER AND THE INLET OF THE OTHER DIGESTER, MEANS INCLUDING A PIPE CONNECTED INTERMEDIATE THE TWO PRESSES FOR CONTINUOUSLY SUPPLYING WASHING LIQUID TO THE MATERIAL AS IT PASSES FROM THE FIRST PRESS TO THE SECOND PRESS, MEANS FOR CONTINUOUSLY RECOVERING THE LIQUID EXPRESSED FROM THE MATERIAL BY THE SECOND PRESS AND-SUPPLYING THE RECOVERED LIQUID TO THE FIRST DIGESTER.
Claim 2
Dependent Claim
102 words
APPARATUS FOR TREATING CELLULOSIC MATERIAL, COMPRISING A PAIR OF DIGESTERS EACH HAVING AN INLET AND AN OUTLET, MEANS SUPPLYING THE MATERIAL TO BE TREATED CONTINUOUSLY TO THE INLET OF ONE DIGESTER, AT LEAST TWO PRESSES CONNECTED IN TANDEM BETWEEN THE OUTLET OF SAID ONE DIGESTER AND THE INLET OF THE OTHER DIGESTER, MEANS INCLUDING A PIPE CONNECTED INTERMEDIATE THE TWO PRESSES FOR CONTINUOUSLY SUPPLYING WASHING LIQUID TO THE MATERIAL AS IT PASSES FROM THE FIRST PRESS TO THE SECOND PRESS, MEANS FOR CONTINUOUSLY RECOVERING THE LIQUID EXPRESSED FROM THE MATERIAL BY THE SECOND PRESS AND-SUPPLYING THE RECOVERED LIQUID TO THE FIRST DIGESTER.
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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) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |