US3153443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange units
Assignee: Individual
•
Filing: 1962-12-03
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Granted: 1964-10-20
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Expires: 1982-12-03
Abstract
No abstract record available.
Inventors
- 👤 Richard W Kritzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:45
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/047; F28D1/0477; B; B21; B21D; B21D53/00; B21D53/02; B21D53/08; B21D53/085; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/32; F28F2215/00; F28F2215/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A HEAT EXCHANGE UNIT COMPRISING, IN COMBINATION, A PLURALITY OF STRAIGHT, PARALLEL, SPACED APART LENGTHS OF ELONGATED TUBE STOCK DISPOSED IN A COMMON PLANE, AND A SERIES OF CLOSELY SPACED, ELONGATED, PARALLEL STRIPS STAMPED FROM COMPARATIVELY FLAT FIN STOCK AND SECURED TO AND EXTENDING BETWEEN SAID LENGTHS TRANSVERSELY THEREOF, EACH STRIP PRESENTING OPPOSITELY FACING INSIDE AND OUTSIDE EDGES RESPECTIVELY, ONE EDGE OF EACH STRIP BEING FORMED WITH A SERIES OF INWARDLY EXTENDING NOTCHES WITHIN WHICH THE LENGTHS OF TUBE STOCK ARE PRESSED WITH A TIGHT FRICTIONAL FIT, THE OTHER EDGE OF EACH STRIP BEING FORMED WITH A SERIES OF SPACED, OUTWARDLY PROJECTING, EARS THEREON OF A SIZE AND SHAPE CONFORMING PRECISELY TO THE SIZE AND SHAPE OF SAID INWARDLY EXTENDING NOTCHES, EACH EAR BEING IN TRANSVERSE ALIGNMENT WITH A RESPECTIVE NOTCH AND ALL OF SAID EARS HAVING THEIR OUTER ENDS TERMINATING IN A COMMON PLANE, THE INNER REGIONS OF EACH NOTCH PRESENTING AN ARCUATE CONTOUR WHICH IS IN THE FORM OF A MAJOR CIRCLE SECTOR.
Claim 2
Dependent Claim
165 words
A HEAT EXCHANGE UNIT COMPRISING, IN COMBINATION, A PLURALITY OF STRAIGHT, PARALLEL, SPACED APART LENGTHS OF ELONGATED TUBE STOCK DISPOSED IN A COMMON PLANE, AND A SERIES OF CLOSELY SPACED, ELONGATED, PARALLEL STRIPS STAMPED FROM COMPARATIVELY FLAT FIN STOCK AND SECURED TO AND EXTENDING BETWEEN SAID LENGTHS TRANSVERSELY THEREOF, EACH STRIP PRESENTING OPPOSITELY FACING INSIDE AND OUTSIDE EDGES RESPECTIVELY, ONE EDGE OF EACH STRIP BEING FORMED WITH A SERIES OF INWARDLY EXTENDING NOTCHES WITHIN WHICH THE LENGTHS OF TUBE STOCK ARE PRESSED WITH A TIGHT FRICTIONAL FIT, THE OTHER EDGE OF EACH STRIP BEING FORMED WITH A SERIES OF SPACED, OUTWARDLY PROJECTING, EARS THEREON OF A SIZE AND SHAPE CONFORMING PRECISELY TO THE SIZE AND SHAPE OF SAID INWARDLY EXTENDING NOTCHES, EACH EAR BEING IN TRANSVERSE ALIGNMENT WITH A RESPECTIVE NOTCH AND ALL OF SAID EARS HAVING THEIR OUTER ENDS TERMINATING IN A COMMON PLANE, THE INNER REGIONS OF EACH NOTCH PRESENTING AN ARCUATE CONTOUR WHICH IS IN THE FORM OF A MAJOR CIRCLE SECTOR.
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) | 1967-10-20 | 1968-04-20 | 1968-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-20 | 1972-04-20 | 1972-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-20 | 1976-04-20 | 1976-10-20 | $7700.00 | Window Closed / Lapsed |