Patent US3818568A successfully refreshed from Google Patents.
US3818568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming heat exchangers
Assignee: Teledyne Mid America Corp
•
Filing: 1973-03-29
•
Granted: 1974-06-25
•
Expires: 1993-03-29
Abstract
Abstract Apparatus for securing a backing sheet to a length of tubing to form heat exchange structure particularly useful as a condenser in a household refrigerator. Spring fingers engage the sides of open grooves in the backing sheet in which the tubing is received to cause the walls of said grooves to be deformed to embrace the tubing and lock the tubing to the backing sheet.
Inventors
- 👤 H Sennstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:03
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/08; B21D53/085; F; F25; F25B; F25B2339/00; F25B2339/04; F25B2339/045; F25B39/00; F25B39/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49359; Y10T29/53; Y10T29/53113; Y10T29/53122
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
Apparatus for securing plate structure to tube structure comprising a pair of relatively movable platens, one of said platens being adapted to support parallel lengths of tubing positioned in grooves in said plate structure, means on the other platen forming surfaces facing said one platen, elongated spring members carried by said surfaces, said spring members being curved in transverse section to dispose the longitudinal edges thereof in spaced relation to said surfaces, and the spacing between adjacent marginal edges of adjacent ones of said spring members being slightly less than the spacing between adjacent lengths of tubing whereby when said platens are relatively moved together, the marginal edges of said spring members engage said plate structure at opposite sides of said lengths of tubing, and, in the continued relative movement of said platens, said marginal edges are displaced laterally away from each other to cause said plate structure to embrace substantially more than half of the periphery of adjacent tube structure.
Claim 2
Dependent Claim
161 words
Apparatus for securing plate structure to tube structure comprising a pair of relatively movable platens, one of said platens being adapted to support parallel lengths of tubing positioned in grooves in said plate structure, means on the other platen forming surfaces facing said one platen, elongated spring members carried by said surfaces, said spring members being curved in transverse section to dispose the longitudinal edges thereof in spaced relation to said surfaces, and the spacing between adjacent marginal edges of adjacent ones of said spring members being slightly less than the spacing between adjacent lengths of tubing whereby when said platens are relatively moved together, the marginal edges of said spring members engage said plate structure at opposite sides of said lengths of tubing, and, in the continued relative movement of said platens, said marginal edges are displaced laterally away from each other to cause said plate structure to embrace substantially more than half of the periphery of adjacent tube structure.
References Cited (Backward Citations)
US2732615A
Cited
US2281299A
Cited
US2585043A
Cited
US2666981A
Cited
US2646259A
Cited
US2661191A
Cited
US2940737A
Cited
US3562058A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |