US2834468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal diffusion apparatus
Assignee: Standard Oil Co
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Filing: 1955-05-11
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Granted: 1958-05-13
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Expires: 1975-05-11
Abstract
No abstract record available.
Inventors
- 👤 John W Thomas
- 👤 Richard W Asmus
- 👤 Wendell T Berg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:30
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
THERMAL DIFFUSION APPARATUS COMPRISING FIRST AND SECOND WALL MEMBERS HAVING OPPOSED SURFACES SPACED APART SUBSTANTIALLY EQUIDISTANTLY FOR FORMING A THERMAL DIFFUSION SEPARATION CHAMBER BETWEEN THEM, ONE OF SAID WALL MEMBERS BEING TRANSPARENT AND HAVING AN ELECTRICALLY CONDUCTIVE FILM SUBSTANTIALLY COEXTENSIVE WITH THE CHAMBER-FORMING SURFACE THEREOF, MEANS FOR INTRODUCING AND WITHDRAWING LIQUID INTO AND FROM SAID CHAMBER, MEANS FOR PASSING AN ELECTRIC CURRENT THROUGH THE CONDUCTIVE FILM AND THEREBY RELATIVELY HEATING THE TRANSPARENT WALL MEMBER, MEANS FOR RELATIVELY COOLING THE OTHER WALL MEMBER, AND MEANS FOR MAINTAINING THE SPACING OF THE CHAMBER-FORMING SURFACES SUBSTANTIALLY CONSTANT.
Claim 2
Dependent Claim
94 words
THERMAL DIFFUSION APPARATUS COMPRISING FIRST AND SECOND WALL MEMBERS HAVING OPPOSED SURFACES SPACED APART SUBSTANTIALLY EQUIDISTANTLY FOR FORMING A THERMAL DIFFUSION SEPARATION CHAMBER BETWEEN THEM, ONE OF SAID WALL MEMBERS BEING TRANSPARENT AND HAVING AN ELECTRICALLY CONDUCTIVE FILM SUBSTANTIALLY COEXTENSIVE WITH THE CHAMBER-FORMING SURFACE THEREOF, MEANS FOR INTRODUCING AND WITHDRAWING LIQUID INTO AND FROM SAID CHAMBER, MEANS FOR PASSING AN ELECTRIC CURRENT THROUGH THE CONDUCTIVE FILM AND THEREBY RELATIVELY HEATING THE TRANSPARENT WALL MEMBER, MEANS FOR RELATIVELY COOLING THE OTHER WALL MEMBER, AND MEANS FOR MAINTAINING THE SPACING OF THE CHAMBER-FORMING SURFACES SUBSTANTIALLY CONSTANT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |