US3758833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wound film capacitor
Assignee: Illinois Tool Works Inc
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Filing: 1973-02-21
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Granted: 1973-09-11
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Expires: 1993-02-21
Abstract
Abstract A film capacitor wound about its lead wires so that at least three layers of dielectric material are sandwiched between two layers of electrodes with transverse portions of the electrodes and three layers of dielectric being positioned between axial portions of two lead wires. One of the dielectric layers being a short relatively thick thermoplastic material and which, upon being heated, shrinks to lock the leads in firm engagement with the electrode layers. The relatively thick dielectric insert also providing protection against shorts at the center of the capacitor.
Inventors
- 👤 C Rayburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:29
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/228; H01G4/242; H01G4/245; H01G4/32
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
21 words
The capacitor of claim 1, wherein the relatively short length of thermoplastic material is thicker than the other two dielectric layers.
Claim 2
Dependent Claim
14 words
The capacitor of claim 1, wherein the longer strips of dielectric are polyester film.
Claim 3
Dependent Claim
14 words
The capacitor of claim 1, wherein the longer strips of dielectric are polycarbonate film.
Claim 4
Dependent Claim
46 words
A wound capacitor in accordance with claim 1, wherein the shorter strip of dielectric includes a longitudinal portion wrapped around at least 270* of the periphery of each lead wire to firmly lock the leads within the capacitor body when the dielectric is subjected to heat.
Claim 5
Dependent Claim
46 words
The capacitor of claim 1, wherein a portion of the axial extent of each lead wire extending transversely of the electrode strips is noncircular in cross section to lock the leads within the capacitor body when the short heat shrinkable dielectric strip is subjected to heat.
References Cited (Backward Citations)
US3638086A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |