US2720976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal diffusion apparatus
Assignee: Standard Oil Co
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Filing: 1952-02-27
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Granted: 1955-10-18
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Expires: 1972-02-27
Abstract
No abstract record available.
Inventors
- 👤 Jones Arthur Letcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:17
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
LIQUID THERMAL DIFFUSION APPARATUS COMPRISING TWO SUBSTANTIALLY PARALLEL, LIQUID-IMPERVIOUS STATIONARY WALLS, THE OPPOSED FACES OF WHICH ARE SMOOTH AND SPACED APART A DISTANCE LESS THAN ABOUT 0.15 INCH TO FORM A SUBSTAN TIALLY UNIFORM NARROW SLIT, MEANS FOR RELATIVELY HEATING AND COOLING SAID WALLS TO IMPOSE A TEMPERATURE GRADIENT ACROSS SAID SLIT AN INLET COMMUNICATING WITH THE SLIT AND AT LEAST TWO OUTLETS COMMUNICATING WITH THE SLIT, WHEREIN AT LEAST ONE OF THE OUTLETS COMPRISES AN ELONGATED POROUS SECTION IN THE FACE OF ONE OF THE WALLS, ONE FACE OF THE POROUS SECTION BEING IN SUBSTANTIALLY THE SAME PLANE AS THE WALL FACE, AND A PASSAGE FOR LIQUID EXTENDING TO THE EXTERIOR OF THE APPARATUS, ONE PORTION OF SAID PASSAGE BEING SUBSTANTIALLY COEXTENSIVE WITH AN CONTIGUOUS TO THE POROUS SECTION.
Claim 2
Dependent Claim
130 words
LIQUID THERMAL DIFFUSION APPARATUS COMPRISING TWO SUBSTANTIALLY PARALLEL, LIQUID-IMPERVIOUS STATIONARY WALLS, THE OPPOSED FACES OF WHICH ARE SMOOTH AND SPACED APART A DISTANCE LESS THAN ABOUT 0.15 INCH TO FORM A SUBSTAN TIALLY UNIFORM NARROW SLIT, MEANS FOR RELATIVELY HEATING AND COOLING SAID WALLS TO IMPOSE A TEMPERATURE GRADIENT ACROSS SAID SLIT AN INLET COMMUNICATING WITH THE SLIT AND AT LEAST TWO OUTLETS COMMUNICATING WITH THE SLIT, WHEREIN AT LEAST ONE OF THE OUTLETS COMPRISES AN ELONGATED POROUS SECTION IN THE FACE OF ONE OF THE WALLS, ONE FACE OF THE POROUS SECTION BEING IN SUBSTANTIALLY THE SAME PLANE AS THE WALL FACE, AND A PASSAGE FOR LIQUID EXTENDING TO THE EXTERIOR OF THE APPARATUS, ONE PORTION OF SAID PASSAGE BEING SUBSTANTIALLY COEXTENSIVE WITH AN CONTIGUOUS TO THE POROUS SECTION.
References Cited (Backward Citations)
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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) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |