US4631250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing covering film and apparatus therefor
Assignee: Vacuum Metallurgical Co Ltd
•
Filing: 1985-03-13
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Granted: 1986-12-23
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Expires: 2005-03-13
Abstract
Abstract A process for removing covering films by blowing CO 2 particles against the film. Fine ice particles may be mixed with the CO 2 particles.
Inventors
- 👤 Chikara Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:11
CPC Classifications
B; B01; B01F; B01F23/00; B01F23/04; B01F23/042; B01F23/09; B01F23/10; B01F23/12; B01F23/30; B01F23/39; B24; B24C; B24C1/00; B24C1/003; B24C3/00; B24C3/32; B24C3/322; G; G03; G03F; G03F7/00; G03F7/26; G03F7/42
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
54 words
A process for removing a covering film from a surface of a substrate wherein CO 2 particles, produced in an air-tight sealed chamber, are blown from a jet nozzle by N 2 gas, said CO 2 particles being introduced into a treatment chamber against a covering film applied to the surface of the substrate.
Claim 2
Dependent Claim
54 words
A process for removing a covering film from a surface of a substrate wherein CO 2 particles, produced in an air-tight sealed chamber, are blown from a jet nozzle by N 2 gas, said CO 2 particles being introduced into a treatment chamber against a covering film applied to the surface of the substrate.
Claim 3
Dependent Claim
25 words
A process as claimed in claim 1, wherein the CO 2 particles are used in such a condition that fine ice particles are mixed therewith.
References Cited (Backward Citations)
US3089775A
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US3074822A
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US3676963A
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US3702519A
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US4038786A
Cited
US4389820A
Cited
US4468453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-22 | 1990-06-23 | 1990-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-22 | 1994-06-23 | 1994-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-22 | 1998-06-23 | 1998-12-23 | $7700.00 | Window Closed / Lapsed |