US4243623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of encapsulating electrical apparatus
Assignee: ABB Inc USA
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Filing: 1979-03-27
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Granted: 1981-01-06
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Expires: 1999-03-27
Abstract
Abstract A method of encapsulating electrical apparatus in a particulate filler material which is cohesively bonded together by a binder material which forms beads around the points of contact between contiguous particles. The filler material includes uncoated and dry, resin-coated particles, with the dry resin being redistributed after the particles of filler are in position about the electrical apparatus by the step of liquifying the resin coating with a liquid solvent, to form beads around the points of contact between contiguous particles.
Inventors
- 👤 Gerhard R. Sprengling
- 👤 Louis A. Cargnel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:04
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/20; H01F38/22; H01F38/28; H01F38/30; B; B29; B29C; B29C67/00; B29C67/24; B29C67/242; B29C67/243; B29C67/244; B29C70/00; B29C70/68; B29C70/70; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/40; H01F27/00; H01F27/02; H01F27/022; H01F27/08; H01F27/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
222 words
A method of encapsulating an electrical apparatus comprising the steps of: positioning said electrical apparatus in a case; filling the space between said case and said electrical apparatus with a first particulate filler material, having a first predetermined particle size range, to a predetermined level in the case; pouring a second particulate filler material, having a second predetermined particle size range, onto the first filler material, with the first and second predetermined particle size ranges being selected such that vibration of the case will cause substantially uniform dispersion of the second filler material in the first filler material, and with the particles of the second filler material each being coated with a dry "B" stage thermosetting resin; vibrating said case until said second filler material is substantially evenly dispersed through said first filler material; pouring a predetermined quantity of a liquid into said case, with said liquid being a solvent for the resin coating on the particles of the second filler, to liquefy the dry resin on the particles of said second filler material and provide direct particle-to-particle contact between adjacent particles of said first and second filler materials with the contact points being surrounded by beads of said liquefied resin; and solidifying said liquefied resin to form an intersticial mass of said first and second filler materials around said electrical apparatus.
Claim 2
Independent Claim
222 words
A method of encapsulating an electrical apparatus comprising the steps of: positioning said electrical apparatus in a case; filling the space between said case and said electrical apparatus with a first particulate filler material, having a first predetermined particle size range, to a predetermined level in the case; pouring a second particulate filler material, having a second predetermined particle size range, onto the first filler material, with the first and second predetermined particle size ranges being selected such that vibration of the case will cause substantially uniform dispersion of the second filler material in the first filler material, and with the particles of the second filler material each being coated with a dry "B" stage thermosetting resin; vibrating said case until said second filler material is substantially evenly dispersed through said first filler material; pouring a predetermined quantity of a liquid into said case, with said liquid being a solvent for the resin coating on the particles of the second filler, to liquefy the dry resin on the particles of said second filler material and provide direct particle-to-particle contact between adjacent particles of said first and second filler materials with the contact points being surrounded by beads of said liquefied resin; and solidifying said liquefied resin to form an intersticial mass of said first and second filler materials around said electrical apparatus.
Claim 3
Dependent Claim
29 words
The method of claim 1 further including the step of dissolving a predetermined quantitity of resin in the liquid solvent prior to pouring the liquid solvent into the case.
Claim 4
Independent Claim
129 words
A method of encapsulating an electrical apparatus comprising the steps of: positioning said electrical apparatus in a case; providing a particulate filler in the space between said case and said electrical apparatus, with at least certain of the particles being coated with a dry "B" stage thermosetting resin, and with the coated particles being substantially uniformly mixed with any uncoated particles; liquefying the coating of resin on the coated particles of said filler by contacting the resin coating on the coated particles with a solvent for the resin, to provide direct particle-to-particle contact between adjacent particles of said filler, with the contact points being surrounded by beads of said liquefied resin; and solidifying said liquefied resin to form an intersticial mass of said particulate filler around said electrical apparatus.
Claim 5
Independent Claim
129 words
A method of encapsulating an electrical apparatus comprising the steps of: positioning said electrical apparatus in a case; providing a particulate filler in the space between said case and said electrical apparatus, with at least certain of the particles being coated with a dry "B" stage thermosetting resin, and with the coated particles being substantially uniformly mixed with any uncoated particles; liquefying the coating of resin on the coated particles of said filler by contacting the resin coating on the coated particles with a solvent for the resin, to provide direct particle-to-particle contact between adjacent particles of said filler, with the contact points being surrounded by beads of said liquefied resin; and solidifying said liquefied resin to form an intersticial mass of said particulate filler around said electrical apparatus.
Claim 6
Dependent Claim
84 words
The method of claim 3 wherein the step of providing a particulate filler in the space between the case and electrical apparatus includes the step of adding first and second particulate fillers to said case having different particle sizes with one of the fillers having the dry resin coating therein and the other of the fillers being uncoated, and subsquently vibrating the case, with the particle sizes being selected such that the first and second particulate fillers are uniformly mixed by the vibration step.
Claim 7
Dependent Claim
31 words
The method of claim 3 wherein the step of contacting the resin coating with a solvent includes the steps of pouring a liquid solvent into the case, over the particulate filler.
Claim 8
Dependent Claim
28 words
The method of claim 3 wherein the step of solidifying the liquid resin includes the step of heating the resin to a predetermined temperature for a predetermined time.
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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) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |