Patent US4022635A successfully refreshed from Google Patents.
US4022635A
Expired / Lapsed
US
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Modified asphaltite potting composition
Assignee: General Electric Co
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Filing: 1975-09-17
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Granted: 1977-05-10
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Expires: 1995-09-17
Abstract
Abstract A modified gilsonite base encapsulating system having improved sound suppression properties and rheologically controlled characteristics. In one aspect of the invention and in one form of the preferred embodiment, a potting compound is provided wherein the gilsonite is modified by thermal depolymerization. In another form of the preferred embodiment, the gilsonite is modified by the addition of a process oil having a viscosity gravity constant of 0.97 and a viscosity in SSU at 100° C of 48.4 and comprises at least 21% by weight of the composition. Silica filler is added to produce a potting compound having quite unexpected sound suppression qualities. In another aspect of the invention, a gilsonite based coil impregnant compound is provided to produce a material quite compatible with the potting compound. To approximately 75 - 80% of modified gilsonite is added about 20 - 25% by weight of ethylenediamine bisstearamide to produce a mixture having a softening point of from 125° - 130° C and a viscosity at 170° C of from 78 to 118 centipoise.
Inventors
- 👤 Mason H. Earing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:35
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/26; C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; H01B3/20; H01B3/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
104 words
A potting compound comprising: a modified asphaltite composition having a softening point of from 90° C to 125° C, a penetration at 25° C with a 100 gram mass after 5 seconds of from 0 - 5 mm, and a rheological value as measured at 200° C on a Stormer Viscosimeter using a 400 gram mass of from 10 - 100 seconds for 100 revolutions; and electrically insulating and thermally conducting filler material substantially inert to the modified asphaltite composition and having a size of from 20 - 325 mesh to the extent of from 45 - 80% by weight of the asphaltite-filler mixture.
Claim 2
Dependent Claim
104 words
A potting compound comprising: a modified asphaltite composition having a softening point of from 90° C to 125° C, a penetration at 25° C with a 100 gram mass after 5 seconds of from 0 - 5 mm, and a rheological value as measured at 200° C on a Stormer Viscosimeter using a 400 gram mass of from 10 - 100 seconds for 100 revolutions; and electrically insulating and thermally conducting filler material substantially inert to the modified asphaltite composition and having a size of from 20 - 325 mesh to the extent of from 45 - 80% by weight of the asphaltite-filler mixture.
Claim 3
Dependent Claim
35 words
The potting compound as set forth in claim 1 wherein the asphaltite composition is gilsonite which is modified by heating at from 350° to 400° C for 80 - 120 minutes in a nitrogen atmosphere.
Claim 4
Dependent Claim
61 words
The potting compound as set forth in claim 1 wherein the asphaltitel composition is gilsonite which is modified by the addition of an oil having a viscosity gravity constant greater than 0.90 and a viscosity in SSU at 100° C of from 40 to 55 and added to the extent of from 15 to 30% by weight of the oil-gilsonite mixture.
Claim 5
Dependent Claim
95 words
A potting compound for inductive electrical devices comprising: a modified gilsonite composition having a softening point of from 105° to 120° C, a penetration at 25° C with a 100 gram mass after 5 seconds of from 0 to 2 mm, and a rheological value as measured at 200° C on a Stormer Viscosimeter using a 400 gram mass of from 20 - 25 seconds for 100 revolutions; and silica filler to the extent of 50 - 55% by weight of the gilsonite-silica filler mixture, the silica filler being of from 200 to 325 mesh.
Claim 6
Dependent Claim
95 words
A potting compound for inductive electrical devices comprising: a modified gilsonite composition having a softening point of from 105° to 120° C, a penetration at 25° C with a 100 gram mass after 5 seconds of from 0 to 2 mm, and a rheological value as measured at 200° C on a Stormer Viscosimeter using a 400 gram mass of from 20 - 25 seconds for 100 revolutions; and silica filler to the extent of 50 - 55% by weight of the gilsonite-silica filler mixture, the silica filler being of from 200 to 325 mesh.
Claim 7
Dependent Claim
36 words
The potting compound as set forth in claim 4 wherein the gilsonite is modified by heating at from 360° to 380° C for 90 - 100 minutes in a nitrogen atmosphere thereby to effect thermal depolymerization.
Claim 8
Dependent Claim
60 words
The potting compound as set forth in claim 4 wherein the gilsonite is modified by the addition of a process oil having a viscosity gravity constant of from 0.95 to 0.99 and a viscosity in SSU at 100° C of from 48 to 49 and added to the extent of from 20 to 25% by weight of the oil-gilsonite mixture.
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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |