US5248383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing cutting dies
Assignee: Lintec Corp
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Filing: 1992-08-07
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Granted: 1993-09-28
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Expires: 2012-08-07
Abstract
Abstract Processes for producing cutting dies disclosed herein comprise a step of forming on a steel plate a resist, a first etching step of etching this steel plate to form a convex portion having a prescribed height thereon, and a second etching step comprising removing the resist extending from both ends of the top of the convex portion, followed by etching. In the present invention, is is possible to carry out the second etching step several times and also possible to etching further the steel plate after removal of all of the resist remaining on the top of the convex portion. According to the present invention, there are obtained cutting dies having a sharp cutting edge and an arbitrary width of the bottom portion of the edge.
Inventors
- 👤 Yozaburo Hanada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:46
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/28; B23P15/40; B23P15/406; B23P15/24; C; C23; C23F; C23F1/00; C23F1/02; C23F1/04; H; H05; H05K; H05K3/00; H05K3/02; H05K3/04; H05K3/041; Y; Y10; Y10T; Y10T156/00; Y10T156/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
145 words
A process for producing cutting dies, said process comprising a step of forming on a steel plate a resist corresponding to the shape of an edge portion to be formed thereon, a first etching step of subjecting the steel plate, on which the resist has been formed, to etching treatment, thereby forming a convex portion having a prescribed height in a place where the resist has been formed, a second etching step comprising removing the resist extending from both ends of the top of the convex portion, followed by subjecting the steel plate, in which the resist extending from both ends of the top of the convex portion has been removed, to etching, and a resist removal step of removing the resist remained on the top of the convex portion, wherein the aforesaid second etching step is carried out at least one time or more.
Claim 2
Dependent Claim
145 words
A process for producing cutting dies, said process comprising a step of forming on a steel plate a resist corresponding to the shape of an edge portion to be formed thereon, a first etching step of subjecting the steel plate, on which the resist has been formed, to etching treatment, thereby forming a convex portion having a prescribed height in a place where the resist has been formed, a second etching step comprising removing the resist extending from both ends of the top of the convex portion, followed by subjecting the steel plate, in which the resist extending from both ends of the top of the convex portion has been removed, to etching, and a resist removal step of removing the resist remained on the top of the convex portion, wherein the aforesaid second etching step is carried out at least one time or more.
Claim 3
Dependent Claim
165 words
A process for producing cutting dies, said process comprising a step of forming on a steel plate a resist corresponding to the shape of an edge portion to be formed thereon, a first etching step of subjecting the steel plate, on which the resist has been formed, to etching treatment, thereby forming a convex portion having a prescribed height in a place where the resist has been formed, a second etching step comprising removing the resist extending from both ends of the top of the convex portion, followed by subjecting the steel plate, in which the resist extending from both ends of the top of the convex portion has been removed, to etching, a resist removal step of removing the resist remained on the top of the convex portion, and a third etching step of subjecting the steel plate from which all the resist has been removed to etching treatment, wherein the aforesaid second etching step is carried out at least one time or more.
Claim 4
Dependent Claim
165 words
A process for producing cutting dies, said process comprising a step of forming on a steel plate a resist corresponding to the shape of an edge portion to be formed thereon, a first etching step of subjecting the steel plate, on which the resist has been formed, to etching treatment, thereby forming a convex portion having a prescribed height in a place where the resist has been formed, a second etching step comprising removing the resist extending from both ends of the top of the convex portion, followed by subjecting the steel plate, in which the resist extending from both ends of the top of the convex portion has been removed, to etching, a resist removal step of removing the resist remained on the top of the convex portion, and a third etching step of subjecting the steel plate from which all the resist has been removed to etching treatment, wherein the aforesaid second etching step is carried out at least one time or more.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-09-27 | 1997-03-29 | 1997-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-27 | 2001-03-29 | 2001-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-27 | 2005-03-29 | 2005-09-28 | $7700.00 | Window Closed / Lapsed |