Method and means for reducing the skin friction of bodies moving in a fluid medium
Abstract
Abstract 1,258,407. Utilizing energy of radiations. J. CLARK. 10 Dec., 1968 [11 Dec., 1967], No. 58757/68. Heading G6P. A radio-active coating is provided on the skin of aircraft in order to reduce aero-dynamic drag. The energy emission from the coating is controlled by adjustment of the electrical biasing potential. Both beta and alpha emitting coatings are employed and the energy emission from the coating to the air is effected by emission directly into the air or by the excitation of a crystal lattice at the air boundary. In some embodiments, the radio-active material is bonded to the aircraft skin and covered with alternate layers of P and N type semi-conductive layers which have an adjustable bias to control the energy of the alpha or beta emission. PN, NP, PNP, NPN and field-effect junctions may be used. Collimation of the emission is effected by a crystal lattice layer interposed between the radio-active coating and the semiconductive layers. In an alternative form, the radio-active material is alloyed with the semiconductor by ionic bombardment.
Inventors
- 👤 James Clark
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) | 1973-05-04 | 1973-11-03 | 1974-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-04 | 1977-11-03 | 1978-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-04 | 1981-11-03 | 1982-05-05 | $7700.00 | Window Closed / Lapsed |