Patent US4022050A successfully refreshed from Google Patents.
US4022050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a heat exchanger steel
Assignee: Caterpillar Inc
•
Filing: 1975-12-04
•
Granted: 1977-05-10
•
Expires: 1995-12-04
Abstract
Abstract A method of making a heat exchanger sheet is disclosed including progressively forming an elongated flat sheet of metal into a continuously corrugated sheet having a plurality of deeply drawn convolutions which extend across the sheet, and compressing the periphery of the corrugated sheet to provide a substantially flattened edge portion while retaining a centrally disposed corrugated portion with minimal cold working thereof. Preferably, the sheet made thereby has convolutions with slightly sloping walls to better provide a geometrically uniform overlapped pattern in the flattened edge portion thereof.
Inventors
- 👤 Billy J. Davis
- 👤 Harry J. Dawson
- 👤 Ervin E. Mangus
- 👤 Kenneth J. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:17
CPC Classifications
B; B21; B21D; B21D22/00; B21D22/02; B21D22/027; B21D13/00; B21D53/00; B21D53/02; B21D53/04; F; F28; F28F; F28F3/00; F28F3/02; F28F3/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49373
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
103 words
A method of manufacturing a heat exchanger sheet comprising; foldably forming an elongated flat sheet of material into a continuously corrugated sheet by feeding the flat sheet progressively through a forming apparatus, the corrugated sheet being formed with a plurality of deep transverse convolutions which extend across said sheet and with each transverse convolution extending longitudinally in a repetitive pattern; and compressing the periphery of said corrugated sheet to provide a substantially flattened edge portion with a fully overlapping geometrically repetitive collapsed pattern of at least three thicknesses of sheet material while retaining a centrally disposed corrugated portion with minimal cold working thereof.
Claim 2
Independent Claim
103 words
A method of manufacturing a heat exchanger sheet comprising; foldably forming an elongated flat sheet of material into a continuously corrugated sheet by feeding the flat sheet progressively through a forming apparatus, the corrugated sheet being formed with a plurality of deep transverse convolutions which extend across said sheet and with each transverse convolution extending longitudinally in a repetitive pattern; and compressing the periphery of said corrugated sheet to provide a substantially flattened edge portion with a fully overlapping geometrically repetitive collapsed pattern of at least three thicknesses of sheet material while retaining a centrally disposed corrugated portion with minimal cold working thereof.
Claim 3
Independent Claim
52 words
The method of claim wherein said convolutions extend upwardly and depend downwardly a substantially similar distance from a central plane thereof and including the step of compressing the periphery of said corrugated sheet in a die press so constructed and arranged as to position said flattened edge portion on said central plane.
Claim 4
Dependent Claim
35 words
The method of claim 2 including the step of utilizing a pair of dies in said die press having ramp means therein for forming tapered transition zones at the opposite ends of said corrugated portion.
Claim 5
Independent Claim
107 words
A method of manufacturing a heat exchanger sheet comprising; progressively foldably forming an elongated flat sheet of metal into a continuously corrugated sheet having a plurality of transversely oriented and sinuously profiled convolutions which extend fully across said sheet and with each transverse convolution extending longitudinally in a repetitive pattern; and compressing the periphery of said corrugated sheet in a die press so constructed as to provide a substantially flattened edge portion on a central plane of said corrugated sheet with a fully overlapping repetitive pattern of at least three thicknesses of sheet material while retaining a centrally disposed quadrilaterally-shaped corrugated portion with minimal cold working thereof.
Claim 6
Independent Claim
107 words
A method of manufacturing a heat exchanger sheet comprising; progressively foldably forming an elongated flat sheet of metal into a continuously corrugated sheet having a plurality of transversely oriented and sinuously profiled convolutions which extend fully across said sheet and with each transverse convolution extending longitudinally in a repetitive pattern; and compressing the periphery of said corrugated sheet in a die press so constructed as to provide a substantially flattened edge portion on a central plane of said corrugated sheet with a fully overlapping repetitive pattern of at least three thicknesses of sheet material while retaining a centrally disposed quadrilaterally-shaped corrugated portion with minimal cold working thereof.
Claim 7
Dependent Claim
39 words
The method of claim 4 including the step of using a pair of dies in said die press which have ramp means thereon for forming a pair of tapered transisiton zones at each opposite end of said corrugated portion.
Claim 8
Dependent Claim
24 words
The method of claim 5 wherein said tapered transition zones are tapered convergingly outwardly in a symmetrical manner with respect to said central plane.
References Cited (Backward Citations)
US2988033A
Cited
US3119446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |