Patent US4775438A successfully refreshed from Google Patents.
US4775438A
Expired / Lapsed
US
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Process for peeling protective film off a thin article
Assignee: Nitto Denko Corp
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Filing: 1986-10-07
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Granted: 1988-10-04
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Expires: 2006-10-07
Abstract
Abstract A process for peeling a protective film off a thin article such as a silicon wafer is proposed. The film is peeled by sticking an adhesive tape to the protective film on the article and pulling it away from the article. The protective film is peeled only by the adhesive force of the adhesive tape.
Inventors
- 👤 Keigo Funakoshi
- 👤 Kozo Nomura
- 👤 Minoru Ametani
- 👤 Kenji Ohnishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:26
CPC Classifications
C; C07; C07D; C07D491/00; B; B29; B29C; B29C63/00; B29C63/0004; B29C63/0013; B44; B44D; B44D3/00; B44D3/16; H; H05; H05B; H05B3/00; H05B3/20; H05B3/34; H05B3/36; Y; Y10; Y10S; Y10S156/00; Y10S156/918; Y10S156/93; Y10T; Y10T156/00; Y10T156/11; Y10T156/1168; Y10T156/1179
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
Process for removing a protective adhesive film stuck by an adhesive layer to one side of a thin article such as a silicon wafer comprising the steps of pressing a web of adhesive tape along an entire length of said protective film on the article, said web of adhesive tape extending from said article through a pair of rollers to a take-up spindle where one end of said web of adhesive tape is wound, holding said article against movement and removing said protective film from one end to the other by rotating said take-up spindle and moving said pair of rollers parallel to the surface of said article to remove said web of adhesive tape and peel said protective film off the article by the adhesive force of said adhesive tape.
Claim 2
Dependent Claim
131 words
Process for removing a protective adhesive film stuck by an adhesive layer to one side of a thin article such as a silicon wafer comprising the steps of pressing a web of adhesive tape along an entire length of said protective film on the article, said web of adhesive tape extending from said article through a pair of rollers to a take-up spindle where one end of said web of adhesive tape is wound, holding said article against movement and removing said protective film from one end to the other by rotating said take-up spindle and moving said pair of rollers parallel to the surface of said article to remove said web of adhesive tape and peel said protective film off the article by the adhesive force of said adhesive tape.
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) | 1991-10-04 | 1992-04-04 | 1992-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-04 | 1996-04-04 | 1996-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-04 | 2000-04-04 | 2000-10-04 | $7700.00 | Window Closed / Lapsed |