Heat-exchangers
Abstract
Abstract 868,348. Tubular heat exchangers. SVENSKA FLAKTFABRIKEN A. B. Oct. 6, 1959 [Jan. 28, 1959], No. 33834/59, Class 64(3) In a heat exchanger comprising a bank of pipe coils 2 arranged within a casing 1 through which air is caused to flow and wherein each coil consists of a number of tubes 3 interconnected in series by bends 4 located outside the casing, bleed pipes 8 interconnect certain of the bends 4 and this arrangement is said to prevent freezing up and consequent bursting of the tubes, when for example the air is being heated, by permitting the heating fluid to pass between relatively warm and cold zones of the tube bank. The pipes 8 may interconnect tube bends at the air entry end of the pipe or, as indicated at 8<SP>1</SP> may interconnect other tube bends in the bank. Each tube bend may consist of two tube parts interconnected by a member adapted also to receive the end of a pipe 8 or 8<SP>1</SP>.
Inventors
- 👤 Pellmyr Bengt
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) | 1965-04-02 | 1965-10-02 | 1966-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-02 | 1969-10-02 | 1970-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-02 | 1973-10-02 | 1974-04-03 | $7700.00 | Window Closed / Lapsed |