US3217392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger elements
Assignee: Individual
•
Filing: 1962-05-18
•
Granted: 1965-11-16
•
Expires: 1982-05-18
Abstract
No abstract record available.
Inventors
- 👤 Franciscus Roffelsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:26
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/0008; B23K1/0012; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/22; B21C37/26; B21D; B21D53/00; B21D53/02; F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/122; F28F1/34; F28F1/36; F28F1/40; F28F1/405; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49362; Y10T29/49393
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A METHOD OF MANUFACTURING A HEAT-EXCHANGE ELEMENT, COMPRISING THE STEPS OF FORMING AN ELONGATED WIRE HELIX WITH A LONGITUDINALLY EXTENDING ATTACHMENT SURFACE HAVING A LONGITUDINAL RECESS TO PROVIDE A MULTIPLICITY OF TURNS EACH WITH AN INWARDLY CONCAVE ATTACHMENT STRETCH HAVING A PAIR OF PROTUBERANCES DEFINING BETWEEN THEM A RESPECTIVE CONCAVITY; WINDING A SUBSTANTIALLY FLAT SOLDERING STRIP HELICALLY ABOUT AN ELONGATED HEAT-CONDUCTIVE TUBE; WINDING SAID WIRE HELIX UNDER LONGITUDINALLY TENSION HELICALLY ABOUT SAID TUBE WITH SAID ATTACHMENT SURFACE OVERLYING SAID
Claim 2
Independent Claim
79 words
A METHOD OF MANUFACTURING A HEAT-EXCHANGE ELEMENT, COMPRISING THE STEPS OF FORMING AN ELONGATED WIRE HELIX WITH A LONGITUDINALLY EXTENDING ATTACHMENT SURFACE HAVING A LONGITUDINAL RECESS TO PROVIDE A MULTIPLICITY OF TURNS EACH WITH AN INWARDLY CONCAVE ATTACHMENT STRETCH HAVING A PAIR OF PROTUBERANCES DEFINING BETWEEN THEM A RESPECTIVE CONCAVITY; WINDING A SUBSTANTIALLY FLAT SOLDERING STRIP HELICALLY ABOUT AN ELONGATED HEAT-CONDUCTIVE TUBE; WINDING SAID WIRE HELIX UNDER LONGITUDINALLY TENSION HELICALLY ABOUT SAID TUBE WITH SAID ATTACHMENT SURFACE OVERLYING SAID
References Cited (Backward Citations)
US625642A
Cited
FR742490A
Cited
US1052761A
Cited
US1512295A
Cited
US1716743A
Cited
US1960305A
Cited
US2196186A
Cited
US2268680A
Cited
US2308319A
Cited
US2588500A
Cited
US2595457A
Cited
US2505619A
Cited
US2697588A
Cited
US2731245A
Cited
US2872730A
Cited
US2878560A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |