US3690199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical honing of dies
Assignee: Harris Corp
•
Filing: 1970-10-15
•
Granted: 1972-09-12
•
Expires: 1990-10-15
Abstract
Abstract Cooperating male and female cutting and creasing dies for blanking cartons and the like are produced by a chemical milling process and which process includes a final honing step which removes the sharp corners on the lands of the dies prior to installation thereby readying the dies for immediate full speed use on the machine.
Inventors
- 👤 Albert J Sarka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:44
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/28; B23P15/40; B23P15/406; C; C23; C23F; C23F1/00; C23F1/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
21 words
The method of claim 1 wherein said step of removing the sharp edges comprises the step of chemically removing said edges.
Claim 2
Dependent Claim
34 words
The method of claim 1 wherein said step of removing the sharp undercut edges of the lands comprises the step of passing a spray of the etching solution across the surface of the die.
Claim 3
Independent Claim
55 words
A method of removing the sharp edges from undercut areas of a resist pattern on a chemically milled article comprising the steps of: removing the resist material from the undercut areas to expose the surface therebeneath, and applying an etching solution to the exposed surface of the undercut areas thereby to remove the sharp edges.
Claim 4
Dependent Claim
23 words
The method of claim 4 wherein the step of applying the etching solution comprises the step of passing a spray across the surface.
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |