US5032199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a high temperature flexible unitary sleeving insulation
Assignee: Suflex Inc
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Filing: 1990-01-04
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Granted: 1991-07-16
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Expires: 2010-01-04
Abstract
Abstract The present invention discloses a glass covered electrical insulation having an inner lining of glass fibers coated with a flexible, high temperature, electrically insulating silicone polymer, the electrically insulating layer then has a second layer of glass fibers overbraided on it and bonded to it by the use of a heat treating process. A further teaching is the method of making the flexible sleeving and a method of use. The sleeving is particularly adapted for use in VPI processing and has superior flexibility as well as higher temperature capabilities than sleeving of the prior art.
Inventors
- 👤 Louis G. Landry
- 👤 Fabian Nunez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:27
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/082; B; B29; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/60; B29C53/62; B29C53/66; D; D04; D04C; D04C1/00; D04C1/02; H01B3/18; H01B3/30; H01B3/46; H01B7/00; H01B7/17; H01B7/29; H01B7/292; H02; H02K; H02K3/00; H02K3/32; H02K3/34; B29L; B29L2023/00; B29L2023/22; B29L2023/225; D10; D10B; D10B2505/00; D10B2505/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
234 words
A method of making a flexible, unitary electrical insulation sleeving comprising, in combination, the steps of: (a) drawing a fiberglass sleeving through a heat source to heat stabilize the fiberglass sleeving; (b) coating the heat stabilized fiberglass sleeving with a silicone rubber having a Shore A durometer hardness of 40 or lower in a die operating at a pressure greater than atmospheric, thereby bonding the silicon rubber to the fiberglass sleeving; (c) heating the coated fiberglass sleeving formed in step (b) in a curing oven heated to a temperature of about 400° F. (204° C.) to about 500° F. (260° C.) to cure the silicone rubber; (d) introducing a gas into one end of the coated fiberglass sleeving to create a positive pressure of from about 1 to about 5 psig within the sleeving; (e) overbraiding the pressurized coated fiberglass sleeving with fiberglass having about 10 to about 20 pics to the inch without adding an adhesive to the silicon rubber; (f) drawing the overbraided coated fiberglass sleeving formed in step (e) through a die and then through a furnace heated to a temperature of about 1,000° F. (537.8° C.) without adding an adhesive to the overbraid; and (g) heating the overbraided coated fiberglass sleeving in the furnace to a temperature sufficient to bond the overbraid directly to the silicon rubber, thereby forming a unitary highly flexible, electrically insulated sleeving with high dielectrics strength.
Claim 2
Independent Claim
234 words
A method of making a flexible, unitary electrical insulation sleeving comprising, in combination, the steps of: (a) drawing a fiberglass sleeving through a heat source to heat stabilize the fiberglass sleeving; (b) coating the heat stabilized fiberglass sleeving with a silicone rubber having a Shore A durometer hardness of 40 or lower in a die operating at a pressure greater than atmospheric, thereby bonding the silicon rubber to the fiberglass sleeving; (c) heating the coated fiberglass sleeving formed in step (b) in a curing oven heated to a temperature of about 400° F. (204° C.) to about 500° F. (260° C.) to cure the silicone rubber; (d) introducing a gas into one end of the coated fiberglass sleeving to create a positive pressure of from about 1 to about 5 psig within the sleeving; (e) overbraiding the pressurized coated fiberglass sleeving with fiberglass having about 10 to about 20 pics to the inch without adding an adhesive to the silicon rubber; (f) drawing the overbraided coated fiberglass sleeving formed in step (e) through a die and then through a furnace heated to a temperature of about 1,000° F. (537.8° C.) without adding an adhesive to the overbraid; and (g) heating the overbraided coated fiberglass sleeving in the furnace to a temperature sufficient to bond the overbraid directly to the silicon rubber, thereby forming a unitary highly flexible, electrically insulated sleeving with high dielectrics strength.
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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) | 1994-07-15 | 1995-01-14 | 1995-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-15 | 1999-01-14 | 1999-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-15 | 2003-01-14 | 2003-07-16 | $7700.00 | Window Closed / Lapsed |