US2789945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal diffusion apparatus
Assignee: Standard Oil Co
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Filing: 1953-08-12
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Granted: 1957-04-23
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Expires: 1973-08-12
Abstract
No abstract record available.
Inventors
- 👤 John W Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:27
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
THERMAL DIFFUSION APPARATUS COMPRISING TWO WALL MEMBERS SUBJECT TO DIFFERENTIAL THERMAL EXPANSION AND CONTRACTION AND HAVING CLOSELY AND SUBSTANTIALLY EQUIDISTANTLY SPACED SURFACES DEFINING A THERMAL DIFFUSION SEPARATION CHAMBER, MEANS ASSOCIATED WITH EACH OF SAID WALL MEMBERRS FOR MAINTAINING ONE OF SAID SURFACES AT A HIGHER TEMPERATURE THAN THE OTHER TO MAINTAIN A TEMPERATURE GRADIENT ACROSS SAID CHAMBER, AND A GASKET HAVING A PORTION THICKER THAN THE SPACING BETWEEN SAID SURFACES AND BEING POSITIONED BETWEEN AND IN CONTACT WITH PORTIONS OF SAID WALL MEMBERS FOR CONFINING FLUID WITHIN SAID CHAMBER, THE GASKET-CONTACTING PORTION OF ONE OF THE WALL MEMBERS HAVING A RECESS IN ITS CHAMBER-DEFINING SURFACE TO ADMIT SAID GASKET, THE GASKET CONTACTING PORTION OF SAID OTHER OF THE WALL MEMBER BEING ALIGNED WITH THE CHAMBER DEFINING SURFACE OF SAID OTHER OF THE WALL MEMBERS.
Claim 2
Dependent Claim
134 words
THERMAL DIFFUSION APPARATUS COMPRISING TWO WALL MEMBERS SUBJECT TO DIFFERENTIAL THERMAL EXPANSION AND CONTRACTION AND HAVING CLOSELY AND SUBSTANTIALLY EQUIDISTANTLY SPACED SURFACES DEFINING A THERMAL DIFFUSION SEPARATION CHAMBER, MEANS ASSOCIATED WITH EACH OF SAID WALL MEMBERRS FOR MAINTAINING ONE OF SAID SURFACES AT A HIGHER TEMPERATURE THAN THE OTHER TO MAINTAIN A TEMPERATURE GRADIENT ACROSS SAID CHAMBER, AND A GASKET HAVING A PORTION THICKER THAN THE SPACING BETWEEN SAID SURFACES AND BEING POSITIONED BETWEEN AND IN CONTACT WITH PORTIONS OF SAID WALL MEMBERS FOR CONFINING FLUID WITHIN SAID CHAMBER, THE GASKET-CONTACTING PORTION OF ONE OF THE WALL MEMBERS HAVING A RECESS IN ITS CHAMBER-DEFINING SURFACE TO ADMIT SAID GASKET, THE GASKET CONTACTING PORTION OF SAID OTHER OF THE WALL MEMBER BEING ALIGNED WITH THE CHAMBER DEFINING SURFACE OF SAID OTHER OF THE WALL MEMBERS.
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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) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |