US3173196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a double-walled tube with one of the tubes having integral therewith projecting fin means radially separating the tubes
Assignee: Individual
•
Filing: 1959-11-02
•
Granted: 1965-03-16
•
Expires: 1979-11-02
Abstract
No abstract record available.
Inventors
- 👤 Donald F Grimm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:40
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/14; F; F16; F16L; F16L11/00; F16L11/04; F16L11/12; F16L11/121; F16L9/00; F16L9/18; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49361; Y10T29/49377; Y10T29/49378; Y10T29/49384; Y10T29/49805; Y10T29/49826; Y10T29/49879; Y10T29/49908; Y10T29/49938; Y10T29/4994
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
THE METHOD OF MAKING DOUBLE WALLED TUBE STRUCTURE WHICH COMPRISES FLATTENING AND FOLDING A FIRST TUBULAR STOCK, ROLLING THE FLATTENED AND FOLDED STOCK TO REDUCE WALL THICKNESS AND TO ELONGATE THE STOCK, AND THEREAFTER OPENING THE ROLLED STOCK TO FORM A FIRST THIN WALLED TUBE HAVING AT LEAST ONE LONGITUDINALLY AND RADIALLY INWARDLY EXTENDING INTEGRAL FIN; FLATTENING A SECOND TUBULAR STOCK OF SLIGHTLY SMALLER TRANSVERSE DIMENSIONS THAN SAID FIRST TUBULAR STOCK, ROLLING THE SECOND TUBULAR STOCK TO REDUCE WALL THICKNESS AND TO ELONGATE THE STOCK; INSERTING THE ROLLED SECOND TUBULAR STOCK THE FIRST THIN WALLED TUBE, AND THEREAFTER OPENING THE SECOND ROLLED TUBULAR STOCK TO FORM A SECOND THIN WALLED TUBE DISPOSED WITHIN SAID FIRST TUBE AND HAVING AT LEAST A PAIR OF LONGITUDINALLY AND RADIALLY OUTWARDLY EXTENDING FINS, THE FINS OF BOTH OF SAID TUBE COOPERATING TO SPACE THE SECOND INNER TUBE FROM THE FIRST OUTER TUBE.
Claim 2
Independent Claim
148 words
THE METHOD OF MAKING DOUBLE WALLED TUBE STRUCTURE WHICH COMPRISES FLATTENING AND FOLDING A FIRST TUBULAR STOCK, ROLLING THE FLATTENED AND FOLDED STOCK TO REDUCE WALL THICKNESS AND TO ELONGATE THE STOCK, AND THEREAFTER OPENING THE ROLLED STOCK TO FORM A FIRST THIN WALLED TUBE HAVING AT LEAST ONE LONGITUDINALLY AND RADIALLY INWARDLY EXTENDING INTEGRAL FIN; FLATTENING A SECOND TUBULAR STOCK OF SLIGHTLY SMALLER TRANSVERSE DIMENSIONS THAN SAID FIRST TUBULAR STOCK, ROLLING THE SECOND TUBULAR STOCK TO REDUCE WALL THICKNESS AND TO ELONGATE THE STOCK; INSERTING THE ROLLED SECOND TUBULAR STOCK THE FIRST THIN WALLED TUBE, AND THEREAFTER OPENING THE SECOND ROLLED TUBULAR STOCK TO FORM A SECOND THIN WALLED TUBE DISPOSED WITHIN SAID FIRST TUBE AND HAVING AT LEAST A PAIR OF LONGITUDINALLY AND RADIALLY OUTWARDLY EXTENDING FINS, THE FINS OF BOTH OF SAID TUBE COOPERATING TO SPACE THE SECOND INNER TUBE FROM THE FIRST OUTER TUBE.
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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) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |