Patent US3677756A successfully refreshed from Google Patents.
US3677756A
Expired / Lapsed
US
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Method of dry powder etching
Assignee: Primary Products Ingredients Americas LLC
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Filing: 1970-09-21
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Granted: 1972-07-18
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Expires: 1990-09-21
Abstract
Abstract THE PROCESS FOR ETCHING AN ETCHABLE LAYER WITHOUT A RESIST COMPRISING THE STEPS OF EXPOSING AN ETCHABLE LAYER BEARING A LIGHT-SENSITIVE LAYER CAPABLE OF RECEIVING A POWDER IN IMAGE-WISE CONFIGURATION TO ACTINIC RADIATION TO FORM A LATENT POWDER-RECEPTIVE IMAGE; DEVELOPING SAID LATENT IMAGE WITH SUPERFICIALLY DRY ETCHANT PARTICLES TO FORM A LAYER OF ETCHANT PARTICLES IN IMAGE-WISE CONFIGURATION; REMOVING ETCHANT PARTICLES, FROM THE NON-IMAGE AREAS OF SAID LIGHT-SENSITIVE LAYER, AND CARRYING OUT SAID ETCHING REACTION IN A PREDETERMINED CONFIGURATION CONFORMING TO THE IMAGE-WISE CONFIGURATION OF THE SUPERIFICALLY DRY ETCHANT PARTICLES.
Inventors
- 👤 Thomas F Protzman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:32
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/26; G03F7/28
Claims Analysis
Total Claims: 0
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References 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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |