Patent US1981303A successfully refreshed from Google Patents.
US3341925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making sheet metal heat exchangers with air centers
Assignee: Motors Liquidation Co
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Filing: 1963-06-26
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Granted: 1967-09-19
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Expires: 1983-06-26
Abstract
No abstract record available.
Inventors
- 👤 George W Gerstung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:16
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/03; F28D1/0391; B; B21; B21D; B21D53/00; B21D53/02; B21D53/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49366
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
200 words
A METHOD OF MAKING A HEAT EXCHANGER HAVING OPPOSITE SIDES FOR ADMITTING AND DICHARGING A FIRST FLUID SUCH AS AIR, SAID METHOD COMPRISING FORMING WIDE PORTIONS ALTERNATING WITH NARROW STRIPS ALONG A LENGTH OF SHEET METAL, THE SAID FORMING INCLUDING HOLDING PERIPHERAL MARGINS OF ALTERNATE PAIRS OF SAID WIDE PORTIONS IN THE FLAT AND PRESSING THE METAL ENCLOSED BY SAID MARGINS OF SAID ALTERNATE PAIRS INTO RIDGES PROTRUDING FROM ONE SIDE OF SAID SHEET AND INTO RIDGES ALSO ON SAID ONE SIDE AND EXTENDING ENTIRELY ACROSS THE OTHER PAIRS OF SAID WIDE PORTIONS, FORMING OPENINGS DEFINED BY PERIPHERAL FLANGES IN EACH OF SAID WIDE PORTIONS, FOLDING AND COMPRESSING SAID SHEET WITH FOLD LINES WITHIN SAID NARROW STRIPS INTO ZIGZAG FORMATION WITH THE RIDGES AND PERIPHERAL FLANGE OF EACH WIDE PORTION OF AN ALTERNATE PAIR INTO FACING RELATION WITH THE RIDGES AND PERIPHERAL FLANGE OF THE ADJACENT WIDE PORTION OF SAID ALTERNATE PAIR, SECURING THE PERIPHERAL FLANGES OF EACH PAIR OF ALTERNATE WIDE PORTIONS TOGETHER, AND SAID METHOD INCLUDING THE REMOVAL OF SHEET METAL FROM EACH OF SAID NARROW STRIPS CONNECTING THE WIDE PORTIONS OF THE ALTERNATE PAIR TO AN ADJACENT WIDE PORTION TO OPEN THE GROOVES FROMED BY CORRESPONDING RIDGES.
Claim 2
Independent Claim
200 words
A METHOD OF MAKING A HEAT EXCHANGER HAVING OPPOSITE SIDES FOR ADMITTING AND DICHARGING A FIRST FLUID SUCH AS AIR, SAID METHOD COMPRISING FORMING WIDE PORTIONS ALTERNATING WITH NARROW STRIPS ALONG A LENGTH OF SHEET METAL, THE SAID FORMING INCLUDING HOLDING PERIPHERAL MARGINS OF ALTERNATE PAIRS OF SAID WIDE PORTIONS IN THE FLAT AND PRESSING THE METAL ENCLOSED BY SAID MARGINS OF SAID ALTERNATE PAIRS INTO RIDGES PROTRUDING FROM ONE SIDE OF SAID SHEET AND INTO RIDGES ALSO ON SAID ONE SIDE AND EXTENDING ENTIRELY ACROSS THE OTHER PAIRS OF SAID WIDE PORTIONS, FORMING OPENINGS DEFINED BY PERIPHERAL FLANGES IN EACH OF SAID WIDE PORTIONS, FOLDING AND COMPRESSING SAID SHEET WITH FOLD LINES WITHIN SAID NARROW STRIPS INTO ZIGZAG FORMATION WITH THE RIDGES AND PERIPHERAL FLANGE OF EACH WIDE PORTION OF AN ALTERNATE PAIR INTO FACING RELATION WITH THE RIDGES AND PERIPHERAL FLANGE OF THE ADJACENT WIDE PORTION OF SAID ALTERNATE PAIR, SECURING THE PERIPHERAL FLANGES OF EACH PAIR OF ALTERNATE WIDE PORTIONS TOGETHER, AND SAID METHOD INCLUDING THE REMOVAL OF SHEET METAL FROM EACH OF SAID NARROW STRIPS CONNECTING THE WIDE PORTIONS OF THE ALTERNATE PAIR TO AN ADJACENT WIDE PORTION TO OPEN THE GROOVES FROMED BY CORRESPONDING RIDGES.
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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) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |