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Patent US3947939A successfully refreshed from Google Patents.
US3947939A
Expired / Lapsed
US
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Method for the manufacture of turbulators
Assignee: Foster Wheeler Energy Corp
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Filing: 1974-07-18
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Granted: 1976-04-06
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Expires: 1994-07-18
Abstract
Abstract A multivane turbulator has been provided wherein at least two "V"-shaped members forming the vanes thereof are disposed with their vertices adjacent one another and twisted about each other such that the pitch of the twist is sufficient to render the turbulator self-supporting with symetrically disposed vanes about a central axis. The method of forming the turbulators includes the steps of bending at least two strips of flat stock into "V"-shaped members and disposing one adjacent the other at their vertices and twisting same until the vanes are self-supporting.
Inventors
- 👤 Peter Steiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:02
CPC Classifications
B; B21; B21D; B21D11/00; B21D11/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49337; Y10T29/49826; Y10T29/49908
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
76 words
A method of forming a multivane turbulator for insertion into a tube comprising: bending at least two strips of flat stock into V-shaped members, disposing said V-shaped members in a position which is adjacent their vertices and twisting said V-shaped members together from an end so as to form a plurality of vanes having a pitch self-supporting such that said vanes generally extend radially in cross section, and inserting the turbulator so formed into said tube.
Claim 2
Independent Claim
76 words
A method of forming a multivane turbulator for insertion into a tube comprising: bending at least two strips of flat stock into V-shaped members, disposing said V-shaped members in a position which is adjacent their vertices and twisting said V-shaped members together from an end so as to form a plurality of vanes having a pitch self-supporting such that said vanes generally extend radially in cross section, and inserting the turbulator so formed into said tube.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein said V-shaped members are bent at angles of about 90°.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein three V-shaped members are bent at angles of about 60° and are twisted together.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein four V-shaped members are bent at about 45-degree angles and are twisted together.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein the pitch of the twist is approximately 180° for a distance of about two diameters of the turbulator.
Claim 7
Dependent Claim
30 words
The method of claim 1 wherein the vanes are generally symetrically disposed about a central axis of the turbulator when V-shaped members of the same approximate angular bend are twisted.
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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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |