Patent US3676219A successfully refreshed from Google Patents.
US3676219A
Expired / Lapsed
US
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Chemical strippers and method of using
Assignee: Henley Group Inc
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Filing: 1970-09-25
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Granted: 1972-07-11
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Expires: 1990-09-25
Abstract
Abstract STRIPPERS FOR REMOVAL OF ORGANIC FILMS AND DEPOSITS, SUCH AS THE POLYMERIC ETCH RESISTS EMPLOYED IN THE MANUFACTURE OF SEMICONDUCTORS FROM SILICON BODIES OR SILICON DIOXIDE COATED SILICON BODIES, ARE COMPOSED OF SOLUTIONS OF CHROMIUM TRIOXIDE IN MIXTURES OF STRONG NITRIC AND SULFURIC ACIDS CONTAINING ABOUT 2% TO ABOUT 20% WATER.
Inventors
- 👤 Kenneth H Schroeder
- 👤 George J Kelly Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:11
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/80; C04B41/91; C23; C23G; C23G1/00; C23G1/02; G; G03; G03F; G03F7/00; G03F7/26; G03F7/42; G03F7/422; G03F7/423; H; H10; H10W; H10W74/00; H10W74/40; H10W74/47
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |