US5009735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for peeling protective film off a wafer
Assignee: Nitto Denko Corp
•
Filing: 1988-11-28
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Granted: 1991-04-23
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Expires: 2008-11-28
Abstract
Abstract A process for peeling a protective film stuck to an upper-side of a wafer is disclosed. The protective film is peeled by adhering an adhesive tape to the upper side of the rear end of said protective film stuck on the wafer by means of a press roller, lifting the press roller and sliding said press roller forward, sliding a peeling unit forward to peel the adhesive tape together with the protective film by utilizing the adhesive force of the adhesive tape. The wafer is prevented from being damaged.
Inventors
- 👤 Minoru Ametani
- 👤 Keigo Funakoshi
- 👤 Akihiko Kira
- 👤 Takao Matsushita
- 👤 Keizo Shirakura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:36
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/04; H10P72/0442; B; B29; B29C; B29C63/00; B29C63/0004; B29C63/0013; Y; Y10; Y10S; Y10S156/00; Y10S156/918; Y10S156/93; Y10T; Y10T156/00; Y10T156/11; Y10T156/1168; Y10T156/1179
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
111 words
A process for peeling a protective film stuck to an upper side of a wafer, comprising feeding a wafer with a protective film stuck thereon to a table and holding the wafer in position on the table, adhering an adhesive tape to an upper side of a rear end of said protective film stuck on the wafer by means of a press roller, lifting the press roller, so that the press roller no longer presses against said protective film, and moving said press roller forward, moving a peeling unit forward to peel the adhesive tape together with the protective film stuck thereto, and then carrying away the wafer form the table.
Claim 2
Dependent Claim
111 words
A process for peeling a protective film stuck to an upper side of a wafer, comprising feeding a wafer with a protective film stuck thereon to a table and holding the wafer in position on the table, adhering an adhesive tape to an upper side of a rear end of said protective film stuck on the wafer by means of a press roller, lifting the press roller, so that the press roller no longer presses against said protective film, and moving said press roller forward, moving a peeling unit forward to peel the adhesive tape together with the protective film stuck thereto, and then carrying away the wafer form the table.
Claim 3
Dependent Claim
65 words
A process as claimed in claim 1, wherein the wafer is fixed on the table, the adhesive tape is adhered on said rear end of the protective film on the wafer with the press roller, and said peeling unit is moved forward while lifting the press roller and moving the same forward, thereby peeling the protective film together with the adhesive tape from the wafer.
Claim 4
Dependent Claim
71 words
A process as claimed in claim 1 or 2, wherein the wafer is fixed on the table, the adhesive tape is adhered on the rear end of the protective film on the wafer with the press roller, the press roller is lifted and moved forward, and the press roller is dropped at the front side of the wafer to contact the adhesive tape with a front end of the protective film.
Claim 5
Dependent Claim
72 words
A process as claimed in claim 1 or 2, wherein the wafer is fixed on the table, the adhesive tape is adhered on the rear end of the protective film on the wafer with the press roller, the press roller is lifted and moved forward, and the press roller is dropped in a front area of the wafer to contact the adhesive tape with the table in the front of the wafer.
Claim 6
Dependent Claim
59 words
A process as claimed in claims 1 or 2, wherein the step of adhering an adhesive tape to an upper side of a rear end of said protective film stuck on the wafer by mans of a press roller is repeated to strongly adhere the adhesive tape to the upper side of the rear end of the protective film.
Claim 7
Dependent Claim
57 words
A process as claimed in claim 3, wherein the step of adhering an adhesive tape to an upper side of a rear end of said protective film stuck on the wafer by means of a press roller is repeated to strongly adhere the adhesive tape to the upper side of the rear end of the protective film.
Claim 8
Dependent Claim
57 words
A process as claimed in claim 4, wherein the step of adhering an adhesive tape to an upper side of a rear end of said protective film stuck on the wafer by means of a press roller is repeated to strongly adhere the adhesive tape to the upper side of the rear end of the protective film.
References Cited (Backward Citations)
US4285759A
Cited
GB2128580A
Cited
GB2157193A
Cited
US4631103A
Cited
US4732642A
Cited
US4770737A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-22 | 1994-10-22 | 1995-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-22 | 1998-10-22 | 1999-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-22 | 2002-10-22 | 2003-04-23 | $7700.00 | Window Closed / Lapsed |