US4833027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
String for a musical instrument
Assignee: Kureha Gohsen Co Ltd
•
Filing: 1987-03-19
•
Granted: 1989-05-23
•
Expires: 2007-03-19
Abstract
Abstract A string for a musical instrument consisting of a monofilament made of a resin of vinylidene fluoride and having the following characteristics which give good clearness of sound, good sharpness of sound and good spread of sound: (1) the diameter of the monolfilament is in the range of 0.4 to 1.5 mm φ; (2) the unevenness of the diameter of the monofilament is less than 5% per meter of the monofilament length; (3) the circularity of the section of the monofilament is more than 95%; (4) the specific gravity is more than 1.6; (5) the inherent viscosity is in the range of 1.1 to 1.6 dl/g; (6) the apparent viscosity with the shear rate of 1/100 at 260° C. is in the range of 8000 to 20000 poises; (7) the index of double refraction is in the range of 30×10 -3 to 40×10 -3 ; (8) the tensile strength is more than 50 kg/mm 2 ; (9) the ductility is in the range of 10 to 40%; (10) the creep elongation limit with 20% load of the tensile strength is less than 10%; and (11) the Young's modulus is more than 200 kg/mm 2 .
Inventors
- 👤 Hisaaki Ueba
- 👤 Yoshio Sunaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:36
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/08; D01F6/12; G; G10; G10D; G10D3/00; G10D3/10; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
180 words
A string for a musical instrument consisting of a monofilament made of a resin of vinylidene fluoride which has the following properties: (1) the diameter of the monofilament is in the range of 0.4 to 1.5 mm φ; (2) the unevenness of the diameter of the monofilament is less than 5% per meter of the monofilament length; (3) the circularity of the section of the monofilament is more than 95%; (4) the specific gravity is more than 1.6; (5) the inherent viscosity is in the range of 1.1 to 1.6 dl/g; (6) the apparent viscosity with the shear rate of 1/100 at 260° C. is in the range of 8000 to 20000 poises; (7) the index of double refraction is in the range of 30×10 -3 to 40×10 -3 ; (8) the tensile strength is more than 50 kg/mm 2 ; (9) the ductility is in the range of 10 to 40%; (10) the creep elongation limit with 20% load of the tensile strength is less than 10%; and (11) the Young's modulus is more than 200 kg/mm 2 .
Claim 2
Dependent Claim
180 words
A string for a musical instrument consisting of a monofilament made of a resin of vinylidene fluoride which has the following properties: (1) the diameter of the monofilament is in the range of 0.4 to 1.5 mm φ; (2) the unevenness of the diameter of the monofilament is less than 5% per meter of the monofilament length; (3) the circularity of the section of the monofilament is more than 95%; (4) the specific gravity is more than 1.6; (5) the inherent viscosity is in the range of 1.1 to 1.6 dl/g; (6) the apparent viscosity with the shear rate of 1/100 at 260° C. is in the range of 8000 to 20000 poises; (7) the index of double refraction is in the range of 30×10 -3 to 40×10 -3 ; (8) the tensile strength is more than 50 kg/mm 2 ; (9) the ductility is in the range of 10 to 40%; (10) the creep elongation limit with 20% load of the tensile strength is less than 10%; and (11) the Young's modulus is more than 200 kg/mm 2 .
Claim 3
Dependent Claim
21 words
A string according to claim 1, wherein the unevenness of the diameter of the monofilament is less than 3% per meter.
Claim 4
Dependent Claim
21 words
A string according to claim 2, wherein the unevenness of the diameter of the monofilament is less than 2% per meter.
Claim 5
Dependent Claim
19 words
A string according to claim 1, wherein the circularity of the section of the monofilament is more than 97%.
Claim 6
Dependent Claim
18 words
A string according to claim 1, wherein the specific gravity is in the range of 1.7 to 1.8.
Claim 7
Dependent Claim
18 words
A string according to claim 1, wherein the inherent viscosity is in the range of 1.1 to 1.4.
Claim 8
Dependent Claim
27 words
A string according to claim 1, wherein the apparent viscosity with the shear rate of 1/100 at 260° C. is in the range of 10000 to 15000.
Claim 9
Dependent Claim
23 words
A string according to claim 1, wherein the index of double refraction is in the range of 32×10 -3 to 39×10 -3 .
Claim 10
Dependent Claim
23 words
A string according to claim 8, wherein the index of double refraction is in the range of 35×10 -3 to 38×10 -3 .
Claim 11
Dependent Claim
21 words
A string according to claim 1, wherein the tensile strength is in the range of 60 to 85 kg/mm 2 .
Claim 12
Dependent Claim
17 words
A string according to claim 1, wherein the ductility is in the range of 20 to 30%.
Claim 13
Dependent Claim
26 words
A string according to claim 1, wherein the creep elongation limit with 20% load of the tensile strength is in the range of 3 to 7%.
Claim 14
Dependent Claim
21 words
A string according to claim 1, wherein the Young's modulus is in the range of 250 to 350 kg/mm 2 .
Claim 15
Dependent Claim
54 words
A string according to claim 1, wherein said resin of vinylidene fluoride comprises a copolymer of polyvinylidene fluoride containing more than 80 mole % of homopolymer or monomer of vinylidene fluoride, and another monomer copolymerizable with said polyvinylidene fluoride selected from the group of vinyl fluoride, ethylene chloride trifluoride, ethylene tetrafluoride and propylene hexafluoride.
References Cited (Backward Citations)
JPS4843763A
Cited
JPS5395613A
Cited
JPS5395616A
Cited
JPS5395614A
Cited
US4339499A
Cited
US4382358A
Cited
GB2095166A
Cited
US4667001A
Cited
US4670527A
Cited
US4546158A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-22 | 1992-11-21 | 1993-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-22 | 1996-11-21 | 1997-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-22 | 2000-11-21 | 2001-05-23 | $7700.00 | Window Closed / Lapsed |