US3856566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making insulated magnet wire
Assignee: General Cable Corp
•
Filing: 1973-02-28
•
Granted: 1974-12-24
•
Expires: 1993-02-28
Abstract
Abstract Scrap nylon is used in making the outer coating for magnet wire, but the lowest cost scrap nylon has been that with high amounts of titanium dioxide which gave the wire coating a dull frosty appearance not acceptable to customers. This invention adds considerable additional titanium dioxide to scrap nylon, which instead of causing a dull matte and grainy surface as would be expected, rather causes a slick, smooth surface in the nylon film, not previously found in any nylon surfaces. This slick, smooth surface is felt to be an improvement over the shiny, bright surface previously obtainable.
Inventors
- 👤 H Saunders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:02
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/02; H01B7/0208; H01F; H01F5/00; H01F5/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
104 words
THE METHOD OF MAKING INSULATED MAGNET WIRE HAVING A SLICK, SMOOTH SURFACE WITH A LOW COEFFICIENT OF FRICTION SUITABLE FOR WINDING THE WIRE ON HIGH SPEED WINDING MACHINES, WHICH METHOD COMPRISES PROVIDING AN ELECTRICAL CONDUCTING WIRE PREPARING ANYLON ENAMEL CONTAINING TITANIUM DIOXIDE DISPERSED IN THE ENAMEL, THE TITANIUM DIOXIDE BEING ABOUT 20 TO 40 PERCENT OF THE WEIGHT OF THE SOLIDS IN THE ENAMEL AND IMPARTING A SLICK, SMOOTH SURFACE TO THE ENAMEL, APPLYING INSULATION AROUND THE WIRE TO THE THICKNESS NECESSARY FOR THE INTENDED SERVICE CONDITIONS AND WITH SAID ENAMEL APPLIED AS AT LEAST PART OF THE INSULATION, AND OBTAINED THE SLICK SMOOTH
Claim 2
Independent Claim
104 words
THE METHOD OF MAKING INSULATED MAGNET WIRE HAVING A SLICK, SMOOTH SURFACE WITH A LOW COEFFICIENT OF FRICTION SUITABLE FOR WINDING THE WIRE ON HIGH SPEED WINDING MACHINES, WHICH METHOD COMPRISES PROVIDING AN ELECTRICAL CONDUCTING WIRE PREPARING ANYLON ENAMEL CONTAINING TITANIUM DIOXIDE DISPERSED IN THE ENAMEL, THE TITANIUM DIOXIDE BEING ABOUT 20 TO 40 PERCENT OF THE WEIGHT OF THE SOLIDS IN THE ENAMEL AND IMPARTING A SLICK, SMOOTH SURFACE TO THE ENAMEL, APPLYING INSULATION AROUND THE WIRE TO THE THICKNESS NECESSARY FOR THE INTENDED SERVICE CONDITIONS AND WITH SAID ENAMEL APPLIED AS AT LEAST PART OF THE INSULATION, AND OBTAINED THE SLICK SMOOTH
Claim 3
Dependent Claim
80 words
The method described in claim 1, characterized by applying a polymeric varnish base coat on the wire, Preparing the nylon enamel from nylon scrap, by adding additional titanium dioxide to bring the dioxide content within the range of about 20 percent to 40 percent, these percentages being by weight and being percentages of the weight of nylon plus the weight of titanium dioxide in the enamel, and then applying the nylon enamel as a top coat over the base coat.
Claim 4
Dependent Claim
32 words
The method described in claim 2, characterized by applying a plastic varnish as the undercoat, and applying the nylon enamel over the undercoat to a thickness less than that of the undercoat.
Claim 5
Dependent Claim
30 words
The method described in claim 2, characterized by making the nylon enamel with scrap nylon 6,6 containing from about 200 - 300 parts per million of titanium dioxide by weight.
Claim 6
Dependent Claim
74 words
The method described in claim 2, characterized by applying as a base coat a polymeric film selected from the group consisting of polyvinyl formal, acrylic, polyurethane, polyester, and polyesterimide, and the topcoat being an enamel made from nylon, said enamel including a titanium dioxide pigment in an amount equal to from 4 - 12 percent by weight of the total enamel in the topcoat and imparting to the topcoat the slick and smooth surface.
Claim 7
Dependent Claim
31 words
The method described in claim 2, characterized by applying a base coat and a top coat that leave the wire solderable while the undercoat and top coat are on the wire.
Claim 8
Dependent Claim
31 words
The method described in claim 1, characterized by preparing the nylon enamel with the titanium dioxide constituting from 4 to 12 percent by weight of the total weight of the enamel.
Claim 9
Dependent Claim
45 words
The method described in claim 1, characterized by the nylon enamel comprising nylon 6,6 fiber 15 - 18 percent, titanium dioxide 4 - 12 percent, and solvent for the nylon 81 - 68 percent, the percentage being percentages to the total weight of the enamel.
Claim 10
Dependent Claim
43 words
The method described in claim 8, characterized by the solvent for the nylon including between 20 - 50 percent cresylic acid and from 65 - 47 percent other solvents for the nylon the percentage being percentages to the total weight of the enamel.
Claim 11
Dependent Claim
28 words
The method described in claim 1, characterized by the titanium dioxide being selected from the group consisting of commercial pigment grade titanium dioxide and ceramic grade titanium dioxide.
References Cited (Backward Citations)
US3220882A
Cited
US3215663A
Cited
US3324071A
Cited
US3321566A
Cited
US3528852A
Cited
US3709710A
Cited
US3475212A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |