US3189087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular heat exchangers
Assignee: E Green and Son Ltd
•
Filing: 1958-10-06
•
Granted: 1965-06-15
•
Expires: 1978-10-06
Abstract
No abstract record available.
Inventors
- 👤 Cyril W Parris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:02
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/30; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A HEAT-EXCHANGER TUBE HAVING EXTERNAL GILLS MADE IN HAVING WHICH EXTEND SUBSTANTIALLY HALF WAY ROUND THE TUBE ON OPPOSITE SIDES THEREOF AND ARE JOINED TO THE TUBE BY ELECTRIC RESISTANCE WELDING, WHEREIN THE HALF-GILLS ON ONE SIDE OF THE TUBE HAVE EXTREMITIES SPACED FROM THE EXTERNAL SURFACE OF THE TUBE AND JOINED TO THE CORRESPONDING EXTREMITIES OF THE HALF-GILLS ON THE OPPOSITE SIDE OF THE TUBES BY MEANS INCLUDING ELECTRIC RESISTANCE WELDING.
Claim 2
Dependent Claim
72 words
A HEAT-EXCHANGER TUBE HAVING EXTERNAL GILLS MADE IN HAVING WHICH EXTEND SUBSTANTIALLY HALF WAY ROUND THE TUBE ON OPPOSITE SIDES THEREOF AND ARE JOINED TO THE TUBE BY ELECTRIC RESISTANCE WELDING, WHEREIN THE HALF-GILLS ON ONE SIDE OF THE TUBE HAVE EXTREMITIES SPACED FROM THE EXTERNAL SURFACE OF THE TUBE AND JOINED TO THE CORRESPONDING EXTREMITIES OF THE HALF-GILLS ON THE OPPOSITE SIDE OF THE TUBES BY MEANS INCLUDING ELECTRIC RESISTANCE WELDING.
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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) | 1968-06-14 | 1968-12-14 | 1969-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-14 | 1972-12-14 | 1973-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-14 | 1976-12-14 | 1977-06-15 | $7700.00 | Window Closed / Lapsed |