US3860896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air inductive ballast
Assignee: US Philips Corp
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Filing: 1973-12-04
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Granted: 1975-01-14
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Expires: 1993-12-04
Abstract
Abstract In a ballast a synthetic resin block which swells in vacuo is urged against the connecting conductors of the coil in the ballast. Subsequently the air in the space around the coil is conducted away so that the synthetic resin envelops the connecting conductors. Subsequently an insulating moulding mass is provided around the coil and around the connecting conductors which are surrounded by the synthetic resin.
Inventors
- 👤 Der Hoek Jan Lambertus Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:39
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/02; H01F27/022; H01F38/00; H01F38/08; H01F38/10; H01F41/00; H01F41/005
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
108 words
An inductive ballast comprising a housing, a coil carried within said housing, electrical conductors for connection of electrical power to said coil extending from said coil, a block of elastically deformable synthetic resin having closed cells carried within said housing on said conductors in a space betwen said conductors and an adjacent wall of said housing so that when a vacuum is applied to said housing said space will be substantially filled by said block as a result of pressure developing within said cells and said elastically deformable block swelling and enveloping said conductors, and a molding mass of resinous material occupying the remaining spaces within said housing.
Claim 2
Dependent Claim
108 words
An inductive ballast comprising a housing, a coil carried within said housing, electrical conductors for connection of electrical power to said coil extending from said coil, a block of elastically deformable synthetic resin having closed cells carried within said housing on said conductors in a space betwen said conductors and an adjacent wall of said housing so that when a vacuum is applied to said housing said space will be substantially filled by said block as a result of pressure developing within said cells and said elastically deformable block swelling and enveloping said conductors, and a molding mass of resinous material occupying the remaining spaces within said housing.
Claim 3
Dependent Claim
99 words
The ballast according to claim 1 wherein said block has a plurality of grooves in one side thereof extending in a direction parallel to said conductors so that upon the evacuation of said housing and swelling of said block said grooves will open so as to accommodate said conductors, said grooves being closed to encapsulate said conductors upon filling of said housing with said moulding mass, and further comprising means on said block on the side thereof remote from said conductors for preventing swelling of said side so that said side having said grooves will be curved upon expansion.
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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |