Duplicating process for video disc records
Abstract
Abstract A DUPLICATING PROCESS FOR FORMING DISC RECORDS BEARING OPTICAL RECORDINGS REPRESENTATIVE OF VIDEO SIGNALS IS PROVIDED. A TRANSPARENT DISC, FORMED FOR EXAMPLE OF PLASTIC OR GLASS, HAS A SURFACE COATED WITH AN APPROPRIATE OPAQUE MATERIAL, SUCH AS COPPER. THE SURFACE IS THEN EXPOSED TO A MONOMER VAPOR, FOR EXAMPLE, WHICH IS SELECTIVELY POLYMERIZED BY ELECTROMAGNETIC RADIATION, SUCH AS X-RAYS OR ULTRAVIOLET RAYS, ETC., THROUGH A NEGATIVE OF THE DESIRED VIDEO RECORDINGS. THIS RESULTS IN THE POLYMERIZATION ON THE COATED SURFACE OF THE DISC OF A HYDROCARBON LAYER IN THE PATTERN OF THE VIDEO RECORDINGS OF THE NEGATIVE. THE PORTIONS OF THE COATED SURFACE WHICH ARE NOT COVERED BY THE HYDROCARBON LAYTER ARE THEN ETCHED OFF BY A SUITABLE ETCHANT, SUCH AS CHLORINE GAS, TO PROVIDE A TRANSPARENT PATTERN OF HOLES IN THE OPAQUE COATING WHICH ARE REPRESENTATIVE OF THE VIDEO RECORDINGS.
Inventors
- 👤 Kent D Broadbent
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |