Patent US3903223A successfully refreshed from Google Patents.
US3903223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing an inductive ballast
Assignee: US Philips Corp
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Filing: 1971-12-29
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Granted: 1975-09-02
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Expires: 1991-12-29
Abstract
Abstract The invention relates to a method of manufacturing an inductive ballast for a low-pressure mercury vapor discharge lamp. A block of elastically deformable synthetic material 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 block will expand to envelope 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 14:13
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/08; H01F38/10; H01F27/00; H01F27/02; H01F27/022; H01F41/00; H01F41/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
A METHOD OF MAKING AN INDUCTIVE BALLAST HAVING A HOUSING A COIL WITHIN THE HOUSING, AND ELECTRICAL CONDUCTORS FOR CONNECTION OF THE COIL COMPRISING THE STEPS OF PLACING A BLOCK OF ELASTICALLY DEFORMABLE SYNTHETIC RESIN HAVING CLOSED CELLS WITHIN THE HOUSING ON SAID CONDUCTORS, CLOSING SAID HOUSING SO THAT THE SPACE BETWEEN SAID CONDUCTORS AND THE ADJACENT WALL OF SAID HOUSING IS SUBSTANTIALLY FILLED WITH SAID BLOCK, VACUATING THE INTERIOR OF SAID HOUSING SUFFICIENTLY SO THAT AS A RESUL T OF PRESSURE DEVELOPING WITHIN SAID CELLS, SAID ELASTICALLY DEFORMABLE BLOCK SWELLS AND ENVELOPS EACH OF SAID CONDUCTORS, FILLING THE INTERIOR OF SAID HOUSING WITH A LIQUID RESIN, AND ALLOWING SAID RESIN TO HARDEN.
Claim 2
Independent Claim
113 words
A METHOD OF MAKING AN INDUCTIVE BALLAST HAVING A HOUSING A COIL WITHIN THE HOUSING, AND ELECTRICAL CONDUCTORS FOR CONNECTION OF THE COIL COMPRISING THE STEPS OF PLACING A BLOCK OF ELASTICALLY DEFORMABLE SYNTHETIC RESIN HAVING CLOSED CELLS WITHIN THE HOUSING ON SAID CONDUCTORS, CLOSING SAID HOUSING SO THAT THE SPACE BETWEEN SAID CONDUCTORS AND THE ADJACENT WALL OF SAID HOUSING IS SUBSTANTIALLY FILLED WITH SAID BLOCK, VACUATING THE INTERIOR OF SAID HOUSING SUFFICIENTLY SO THAT AS A RESUL T OF PRESSURE DEVELOPING WITHIN SAID CELLS, SAID ELASTICALLY DEFORMABLE BLOCK SWELLS AND ENVELOPS EACH OF SAID CONDUCTORS, FILLING THE INTERIOR OF SAID HOUSING WITH A LIQUID RESIN, AND ALLOWING SAID RESIN TO HARDEN.
Claim 3
Dependent Claim
45 words
The method according to claim 1 further comprising the step of providing a support for said conductors on the side of said conductors remote from said block, and providing said block on the side thereof remote from said conductors with means to prevent swelling thereof.
Claim 4
Dependent Claim
98 words
The method according to claim 1 further comprising the steps of forming a plurality of grooves in one side of said block in a direction parallel to said conductors so that upon 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 said housing with said resin, and providing means on said bLock on the side thereof remote from said conductors for preventing swelling of said side so that the side having said grooves will be curved upon expansion.
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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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |