US3725215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filler masking of small apertures
Assignee: MICRO SCIENCE ASS
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Filing: 1971-03-17
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Granted: 1973-04-03
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Expires: 1991-03-17
Abstract
Abstract RELATIVELY SMALL APERTURES OR PASSAGES IN A SHEET ARE MASKED TO PREVENT THE PLATING OF THE APERTURES DURING THE ELECTROPLATING OF REMAINING PORTIONS OF THE SHEET BY FILLING THE APERTURES WITH A READILY DEFORMABLE, PHOTO-HARDENABLE MATERIAL. A FACING IS APPLIED TO ONE SIDE OF THE SHEET TO RETAIN THE DEFORMABLE MATERIAL IN THE APERTURES UNTIL THE MATERIAL HAS BEEN SUBJECTED TO REDIENT ENERGY AND THEREBY HARDENED. REMAINING SURFACE PORTIONS OF THE SHEET ARE THEN CONVENTIONALLY ELECTROPLATED AND THEREAFTER THE SHEET IS IMMERSED IN A DISSOLVING AGENT TO STRIP THE PHOTO-HARDENABLE MATERIAL AND BARE THE APERTURES FOR SUBSEQUENT USE OF THE SHEET.
Inventors
- 👤 G Uchytil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:47
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/02; H; H05; H05K; H05K3/00; H05K3/10; H05K3/20; H05K3/202; H05K3/22; H05K3/24; H05K3/243
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |