US3240177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making finned tubing
Assignee: Calumet and Hecla Inc
•
Filing: 1962-06-11
•
Granted: 1966-03-15
•
Expires: 1982-06-11
Abstract
No abstract record available.
Inventors
- 👤 Edward P Habdas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:39
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/34; F28F1/36; B; B21; B21C; B21C37/00; B21C37/06; B21C37/12; B21C37/124; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/49382
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
THE METHOD WHICH COMPRISES HELICALLY COILING A FLANGED STRIP HAVING EDGE FLANGES DEFINING A GENERALLY U-SHAPED CROSS-SECTION ON A ROTATING MANDREL HAVING A LONGITUDINAL OPENING THERETHROUGH INTO A CLOSED HELIX WITH OUTER FLANGE SURFACES OF ADJACENT CONVOLUTIONS IN CONTACT, ROTATING AND SLIDING THE HELICAL COIL CONTINUOUSLY LONGITUDINALLY OF THE MANDREL AND OFF ONE END THEREOF, ADVANCING FLOWABLE BONDING MATERIAL THROUGH THE OPENING IN THE MANDREL INTO THE OPEN INTERIOR OF THE HELICAL COIL, AND ADVANCING THE HELICAL COIL WHILE ROTATING THROUGH A HEATING ZONE TO MELT THE BONDING MATERIAL AND CAUSING IT TO FLOW BY CAPILLARY ACTION ACROSS THE CONTACTING FLANGE SURFACES.
Claim 2
Independent Claim
102 words
THE METHOD WHICH COMPRISES HELICALLY COILING A FLANGED STRIP HAVING EDGE FLANGES DEFINING A GENERALLY U-SHAPED CROSS-SECTION ON A ROTATING MANDREL HAVING A LONGITUDINAL OPENING THERETHROUGH INTO A CLOSED HELIX WITH OUTER FLANGE SURFACES OF ADJACENT CONVOLUTIONS IN CONTACT, ROTATING AND SLIDING THE HELICAL COIL CONTINUOUSLY LONGITUDINALLY OF THE MANDREL AND OFF ONE END THEREOF, ADVANCING FLOWABLE BONDING MATERIAL THROUGH THE OPENING IN THE MANDREL INTO THE OPEN INTERIOR OF THE HELICAL COIL, AND ADVANCING THE HELICAL COIL WHILE ROTATING THROUGH A HEATING ZONE TO MELT THE BONDING MATERIAL AND CAUSING IT TO FLOW BY CAPILLARY ACTION ACROSS THE CONTACTING FLANGE SURFACES.
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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) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |