Air-to-air energy exchange wheel and method of fabrication
Abstract
Abstract ALTERNATING FLAT AND CORRUGATED RIBBONS OF METAL OR OTHER FOIL ARE WRAPPED CONTINUOUSLY IN A SPIRAL AROUND A CENTRAL HUB. WHEN THE APPROPRIATE DIAMETER IS ATTAINED THE OUTER PERIPHERY IS SECURED BY A RIM HAVING AN AXIAL DIMENSION EQUAL TO THE AXIAL DIMENSION OF THE SPIRAL WRAPPING. ANGULARLY SPACED METAL SPOKES ARE INSET IN GROOVES IN OPPOSITE FACES OF THE WHEEL ARE FLUSH WITH SUCH FACES. THE SPOKES ON ONE SIDE OF THE WHEEL ARE OF SUBSTANTIAL AXIAL DIMENSION FOR STRUCTURAL STRENGTH AND ARE SEVURED BOTH TO THE RIM AND TO THE HUB. THINNER SPOKES LOCATED ON THE OPPOSITE FACE OF THE WHEEL ARE GENERALLY PERMITTED TO FLOAT AT ONE OR BOTH ENDS, ALTHOUGH UNDER CERTAIN CIRCUMSTANCES BOTH ENDS MAY BE SECURED.
Inventors
- 👤 Marvin K Rohrs
- 👤 Robert J Neary
Bibliographic Details
Claims Analysis
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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) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |