Patent US3199958A successfully refreshed from Google Patents.
US3199958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telescoping tower for furfural production
Assignee: Individual
•
Filing: 1959-12-11
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Granted: 1965-08-10
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Expires: 1979-12-11
Abstract
No abstract record available.
Inventors
- 👤 Skogh Carl Gunnar Carlsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:19
CPC Classifications
B; B01; B01J; B01J15/00; B01J19/00; B01J19/24; B01J19/2415; C; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/38; C07D307/40; C07D307/46; C07D307/48; C07D307/50; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00159
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
APPARATUS FOR THE CONTINUOUS PRODUCTION AND RECOVERY OF FURFURAL FROM FURFURAL-YIELDING SOLID MATERIAL BY WATER VAPOR TREATMENT AT ELEVATED TEMPERATURE AND PRESSURE, COMPRISING A SUBSTANTIALLY VERTICALLY DISPOSED REACTION VESSEL OF CIRCULAR CROSS SECTION THROUGHOUT ITS LENGTH HAVING CROSS SECTIONAL AREAS INCREASING STEPWISE FROM TOP TO BOTTOM, SAID REACTION VESSEL BEING BOUNDED BY TOP AND BOTTOM CLOSURES AND THEREBETWEEN BY TELESCOPICALLY OVERLAPPING COLLAPSIBLE AND MOVABLE SIDE WALL SECTIONS FORMING AT EACH ZONE OF OVERLAP BETWEEN TWO SUCH SECTIONS A PERIPHERAL ANNULAR CAVITY BOUNDED LATERALLY BY TELESCOPICALLY OVERLAPPING, NON-CONTIGUOUS PORTIONS OF SAID WALL SECTIONS AND UPWARDLY BY CLOSURE MEANS WHILE OPENING DOWNWARDLY INTO THE INTERIOR OF SAID REACTION VESSEL,
Claim 2
Dependent Claim
107 words
APPARATUS FOR THE CONTINUOUS PRODUCTION AND RECOVERY OF FURFURAL FROM FURFURAL-YIELDING SOLID MATERIAL BY WATER VAPOR TREATMENT AT ELEVATED TEMPERATURE AND PRESSURE, COMPRISING A SUBSTANTIALLY VERTICALLY DISPOSED REACTION VESSEL OF CIRCULAR CROSS SECTION THROUGHOUT ITS LENGTH HAVING CROSS SECTIONAL AREAS INCREASING STEPWISE FROM TOP TO BOTTOM, SAID REACTION VESSEL BEING BOUNDED BY TOP AND BOTTOM CLOSURES AND THEREBETWEEN BY TELESCOPICALLY OVERLAPPING COLLAPSIBLE AND MOVABLE SIDE WALL SECTIONS FORMING AT EACH ZONE OF OVERLAP BETWEEN TWO SUCH SECTIONS A PERIPHERAL ANNULAR CAVITY BOUNDED LATERALLY BY TELESCOPICALLY OVERLAPPING, NON-CONTIGUOUS PORTIONS OF SAID WALL SECTIONS AND UPWARDLY BY CLOSURE MEANS WHILE OPENING DOWNWARDLY INTO THE INTERIOR OF SAID REACTION VESSEL,
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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) | 1968-08-09 | 1969-02-08 | 1969-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-09 | 1973-02-08 | 1973-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-09 | 1977-02-08 | 1977-08-10 | $7700.00 | Window Closed / Lapsed |