US3833436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etching of polyimide films
Assignee: Buckbee Mears Co
•
Filing: 1972-09-05
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Granted: 1974-09-03
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Expires: 1992-09-05
Abstract
Abstract A process for the etching of polyimide films which includes applying a photo sensitive resist of a predetermined viscosity and utilizing hydrazine as an etchant to remove unwanted sections of the polyimide film after exposing and developing the light sensitive resist.
Inventors
- 👤 B Hillis
- 👤 R Klint
- 👤 W Cross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:10
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/30; G03F7/32; G03F7/322; F; F25; F25B; F25B31/00; F25B31/02; G03F7/004; G03F7/09; G03F7/095; G03F7/16; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; H05K3/00; H05K3/0011; H05K3/0017; Y; Y10; Y10S; Y10S438/00; Y10S438/942; Y10S438/948
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |