Patent US3732792A successfully refreshed from Google Patents.
US3732792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image plane plate
Assignee: PPG Industries Inc
•
Filing: 1970-12-14
•
Granted: 1973-05-15
•
Expires: 1990-12-14
Abstract
Abstract An image plane glass plate used as a mask or template for printing patterns or circuits onto photosensitive material. A portion or zone of the glass plate is made substantially opaque to ultraviolet light by introducing an ion-exchanged zone in a portion including a surface of the glass. Portions of the zone may be then etched away in a circuit pattern, or the zone may take the form of a circuit pattern.
Inventors
- 👤 M Tarnopol
- 👤 R Twells
- 👤 R Rigby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:20
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/0002; H05K2203/00; H05K2203/05; H05K2203/0548; H05K2203/056; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24926; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/31; Y10T428/315
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
108 words
A method of making an image plane plate comprising the steps of: producing a piece of flat glass having one surface containing tin ions, and ion exchanging silver with sodium ions on said one surface of said piece of glass to produce a silver stain that extends between about 15 to 75 microns into selected portions of said one surface, said stain strengthening said piece and being transparent to visible light, but being opaque to ultraviolet light to the extent that said selected portions have an optical density of at least 3 with respect to radiation of wave lengths between about 3,000 Angstrom units and 5,000 Angstrom units.
Claim 2
Dependent Claim
56 words
A method of making an image plane plate as defined in claim 2, wherein said silver stain is produced by: applying a mixture of silver chromate and titania to said one surface, and heating said piece of glass to cause silver ions in the silver chromate to exchange with sodium ions in said piece of glass.
Claim 3
Independent Claim
123 words
A method of making an image plane plate from a piece of flat glass having one surface containing tin ions, which comprises: applying to selected portions of the tin ion containing surface of the glass a silver containing ion-exchange component; and heating said piece of glass to exchange silver ions from said silver ion-exchange component with sodium ions in said surface so as to stain said surface to a depth of about 15 to 75 microns, said stain strengthening said piece and being transparent to visible light, but being opaque to ultraviolet light to the extent that said selected portions have an optical density of at least about 3 with respect to radiation of wave lengths between about 3,000 Angstroms and 5,000 Angstroms.
Claim 4
Dependent Claim
27 words
A method of making an image plane plate as defined in claim 4, wherein said silver containing ion-exchange component comprises a mixture of silver chromate and titania.
References Cited (Backward Citations)
US2732298A
Cited
US2927042A
Cited
US3468745A
Cited
US3549344A
Cited
US3495963A
Cited
US3429742A
Cited
US3370948A
Cited
US3561963A
Cited
US3528847A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |