Method of fabricating glass coated metal substrates
Abstract
Abstract PINHOLE FREE, GLASS COATED IRON SUBSTRATES SUITABLE FOR UTILIZATION AS RADIO CHASSIS ARE FORMED BY HEATING THE IRON SUBSTRATE ABOVE 500* C. IN A CONTROLLED ATMOSPHERE TO LIMIT OXIDATION OF THE IRON SUBSTRATE SURFACE TO LESS THAN APPROXIMATELY 30,000 A., IMMERSING THE SURFACE OXIDIZED SUBSTRATE IN A FLUIDIZED BED OF GLASS PARTICLES, E.G. VITREOUS ENAMEL FRIT GROUND TO A NARROW PARTICLE SIZE RANGE, TO FUSE THE PARTICLES TO THE SUBSTRATE SURFACE AND SUBSEQUENTLY FIRING THE COATED SUBSTRATE OUTSIDE THE FLUIDIZED BED AT A TEMPERATURE ABOVE 500*C. TO MATURE THE GLASS COATING. DESIRABLY THE FINAL FIRING EMPLOYS HEAT GENERATED WITHIN THE SUBSTRATE, E.G. BY INDUCTION OR RESISTANCE HEATING OF THE SUBSTRATE, TO BAKE THE GLASS OUTWARDLY FROM THE SUBSTRATE-GLASS INTERFACE THEREBY MAXIMIZING THE DENSITY OF THE GLASS COATING.
Inventors
- 👤 Roland T Girard
- 👤 Matthew J Curran
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |