Patent US2412234A successfully refreshed from Google Patents.
US3173200A
Expired / Lapsed
US
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Methods of making sharp-edged metal articles
Assignee: Individual
•
Filing: 1961-12-08
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Granted: 1965-03-16
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Expires: 1981-12-08
Abstract
No abstract record available.
Inventors
- 👤 Dunmire Hannah
- 👤 Harry C Eby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:13
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/28; A61M5/281; A61M5/282; A61B; A61B17/00; A61B17/34; A61B17/3417; A61M5/31; A61M5/32; A61M5/329; B; B21; B21G; B21G1/00; B21G1/08; A61M5/285; A61M5/288; A61M5/3286; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49789; Y10T29/49792; Y10T29/49826; Y10T29/49863; Y10T29/49876; Y10T29/49945; Y10T83/00; Y10T83/04; Y10T83/0524; Y10T83/0529; Y10T83/0534
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
IN THE MANUFACTURE OF SHARP METAL ARTICLES, THE STEPS OF FORMING A METAL BLANK FROM WORK-HARDENABLE METAL STOCK BY FIRST ROUGHLY BLANKING OUT A PORTION OF THE ARTICLE TO BE SHARPENED TO PROVIDE CLEARANCE ADJACENT THAT PORTION WHILE LEAVING THE BALANCE OF THE ARTICLE UNDEFINED, AND COLD WORKING SAID PORTION TO BE SHARPENED TO HARDEN AND REDUCE THE THICKNESS THEREOF, SAID CLEARANCE PROVIDING A SPACE INTO WHICH EXCESS METAL MAY FLOW AS SAID PORTION IS THINNED, AND THEN SHEARING THE BLANK OF FINAL DIMENSION IN THE HARDENED AND THINNED ZONE TO PRODUCE A HARDENED, BURR-FREE EDGE.
Claim 2
Dependent Claim
96 words
IN THE MANUFACTURE OF SHARP METAL ARTICLES, THE STEPS OF FORMING A METAL BLANK FROM WORK-HARDENABLE METAL STOCK BY FIRST ROUGHLY BLANKING OUT A PORTION OF THE ARTICLE TO BE SHARPENED TO PROVIDE CLEARANCE ADJACENT THAT PORTION WHILE LEAVING THE BALANCE OF THE ARTICLE UNDEFINED, AND COLD WORKING SAID PORTION TO BE SHARPENED TO HARDEN AND REDUCE THE THICKNESS THEREOF, SAID CLEARANCE PROVIDING A SPACE INTO WHICH EXCESS METAL MAY FLOW AS SAID PORTION IS THINNED, AND THEN SHEARING THE BLANK OF FINAL DIMENSION IN THE HARDENED AND THINNED ZONE TO PRODUCE A HARDENED, BURR-FREE EDGE.
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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) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |