Double dimpled surface for heat exchange plate
Abstract
Abstract 1,192,326. Heat exchangers. SVENSKA ROTOR MASKINER A.B. 5 July, 1968 [16 Aug., 1967], No. 32160/68. Headings F4K and F4S. Means for forming either a rotary regenerator matrix or a hollow plate heat exchanger comprises heat absorbent plates having dimples formed on opposite sides which alternate with plane sheets so as to form fluid passages therebetween of uniform height. The dimples are so formed that a dimple extending outwardly from one face of a plate comprises an extension of a wall portion of a dimple formed on the opposite face of the plate. The hollow heat exchange is formed by bending two opposing edges of a plane sheet to the height of a dimple and welding the off-set portions to a dimpled sheet.
Inventors
- 👤 Lloyd Donald Grames
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-25 | 1973-02-24 | 1973-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-25 | 1977-02-24 | 1977-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-25 | 1981-02-24 | 1981-08-26 | $7700.00 | Window Closed / Lapsed |