Patent US3578971A successfully refreshed from Google Patents.
US3198248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrugated heat transfer exchangers
Assignee: 3M Co
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Filing: 1963-04-10
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Granted: 1965-08-03
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Expires: 1983-04-10
Abstract
No abstract record available.
Inventors
- 👤 Stack Thomas Noel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:58
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0062; F28D9/0068; F28F; F28F21/00; F28F21/04; F28F2250/00; F28F2250/10; F28F2250/108; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/393; Y10S165/394; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49366
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
A FLUID HANDLING APPARATUS HAVING (I) AT LEAST THREE REGULARLY UNDULATE, SUBSTANTIALLY IDENTICALLY RECTANGULAR, HEAT-EXCHANGING PANELS, SPACED APART WITH LIKE PORTIONS THEREOF SUBSTANTIALLY EQUIDISTANT AT OPPOSING POINTS; (II) AT LEAST TWO SUBSTANTIALLY IDENTICAL, PLANAR SPACER MEMBERS OF TRAPEZOIDAL SHAPE, EACH MEMBER POSITIONED BETWEEN AND SPACING APART A PAIR OF SAID UNDULATE PANELS AND JOINED THERETO ALONG ALL LINES OF CONTACT; SAID SPACER MEMBERS BEING SUBSTANTIALLY COEXTENSIVE OVER A PORTION OF THEIR WIDTH WITH SAID PANELS AND SUBSTANTIALLY COTERMINOUS AT ACUTE-ANGLED CORNERS WITH CORNERS OF SAID PANELS; AND CONSECUTIVE SPACER MEMBERS BEING INVERSELY POSITIONED; AND (III) END PLATES ON TWO SIDE OF THE JOINED PANELS AND MEMBERS, SAID PLATES ON TWO SIDE OF THE JOINED PANELS AND ENDS OF SAID PANELS AND EACH OF SAID PLATES BEING BONDED TO SAID ENDS AND TO ONLY ONE ACUTE-ANGLED MEANS DIRECTING THE FLOW OF FLUID TOWARD AND FROM THE EDGES OF THE JOINED PANELS AND MEMBERS NOT SPANNED BY SAID PLATES.
Claim 2
Dependent Claim
157 words
A FLUID HANDLING APPARATUS HAVING (I) AT LEAST THREE REGULARLY UNDULATE, SUBSTANTIALLY IDENTICALLY RECTANGULAR, HEAT-EXCHANGING PANELS, SPACED APART WITH LIKE PORTIONS THEREOF SUBSTANTIALLY EQUIDISTANT AT OPPOSING POINTS; (II) AT LEAST TWO SUBSTANTIALLY IDENTICAL, PLANAR SPACER MEMBERS OF TRAPEZOIDAL SHAPE, EACH MEMBER POSITIONED BETWEEN AND SPACING APART A PAIR OF SAID UNDULATE PANELS AND JOINED THERETO ALONG ALL LINES OF CONTACT; SAID SPACER MEMBERS BEING SUBSTANTIALLY COEXTENSIVE OVER A PORTION OF THEIR WIDTH WITH SAID PANELS AND SUBSTANTIALLY COTERMINOUS AT ACUTE-ANGLED CORNERS WITH CORNERS OF SAID PANELS; AND CONSECUTIVE SPACER MEMBERS BEING INVERSELY POSITIONED; AND (III) END PLATES ON TWO SIDE OF THE JOINED PANELS AND MEMBERS, SAID PLATES ON TWO SIDE OF THE JOINED PANELS AND ENDS OF SAID PANELS AND EACH OF SAID PLATES BEING BONDED TO SAID ENDS AND TO ONLY ONE ACUTE-ANGLED MEANS DIRECTING THE FLOW OF FLUID TOWARD AND FROM THE EDGES OF THE JOINED PANELS AND MEMBERS NOT SPANNED BY SAID PLATES.
References Cited (Backward Citations)
GB743201A
Cited
US2995344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |