US3732771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knives for fiber tow-cutting apparatus
Assignee: Teijin Ltd
•
Filing: 1971-07-07
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Granted: 1973-05-15
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Expires: 1991-07-07
Abstract
Abstract In knives for the fiber tow-cutting for manufacturing staples by cutting synthetic tows, the improvement comprising I. MAKING THE BLADE BODY OF SUCH KNIVES OF A STEEL MATERIAL HAVING THE FOLLOWING COMPOSITION: Content of C0.08 - 1.10% by weightContent of Si0.15 - 0.80% by weightContent of Cr0.40 - 1.80% by weight Total content of Mn, P and S0 - 1.75% by weightContent of metallicimpurities otherthan Fe and theabove components0 - 5.00% by weightContent of Eeremainder of a total of 100% by weight; and II. PROVIDING ONLY ON ONE SIDE OF SUCH KNIVES A METALLIC COATING LAYER A THICKNESS RANGING FROM 2 MICRONS TO 50 MICRONS AND A Vickers hardness of above 700.
Inventors
- 👤 S Kinoshita
- 👤 K Shinmura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:30
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; D; D01; D01G; D01G1/00; D01G1/02; D01G1/04; Y; Y10; Y10T; Y10T83/00; Y10T83/485; Y10T83/494; Y10T83/929; Y10T83/9372; Y10T83/97
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
The knife of claim 1 wherein i. the composition of said steel material is as follows: Content of C 0.45 - 1.10 % by weight Content of Si 0.15 - 0.70 % by weight Content of Cr 0.50 - 1.60 % by weight Total content of Mn, 0 - 1.21 % by weight P and S Content of metallic impuri- 0 -2.20 % by weight ties other than Fe and the above components ContEnt of Fe remainder of a total of 100 % by weight, and ii. the thickness of said metallic coating layer is 2 - 25 microns.
Claim 2
Dependent Claim
16 words
The knife of claim 1 wherein the edge angle Alpha of said knife is 5*- 40*.
Claim 3
Dependent Claim
20 words
The knife of claim 1 wherein the metal forming said coating layer on one side of said blade is chromium.
Claim 4
Dependent Claim
41 words
The knife of claim 1 wherein the Vickers hardness of the surface of the coating layer on one side of said blade is at least 50 higher than that of the surface of the said blade portion made of steel material.
Claim 5
Dependent Claim
127 words
The knife of claim 1 wherein i. the composition of said steel material is as follows: Content of C 0.80 - 1.10 % by weight Content of Si 0.15 - 0.70 % by weight Content of Cr 0.90 - 1.60 % by weight Total content of Mn, 0 - 1.21 % by weight P and S Content of metallic 0 - 0.50 % by weight impurities other than Fe and the above com-ponents Content of Fe remainder of a total of 100 % by weight; and ii. a metallic coating layer of chromium of thickness of 5 - 25 microns and Vickers hardness of above 700 is provided only on one side of said knife, and the edge angle Alpha of said knife is 10* - 30*.
Claim 6
Dependent Claim
18 words
The knife of claim 2 wherein the edge angle Alpha of said knife is 5* - 044071405 40*.
Claim 7
Dependent Claim
20 words
The knife of claim 2 wherein the metal forming said coating layer on one side of said blade is chromium.
Claim 8
Dependent Claim
41 words
The knife of claim 2 wherein the Vickers hardness of the surface of the coating layer on one side of said blade is at least 50 higher than that of the surface of the said blade portion made of steel material.
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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |