Patent US3915543A successfully refreshed from Google Patents.
US3915543A
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Polarized electric contact blades
Assignee: Heyman Manufacturing Co
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Filing: 1974-10-31
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Granted: 1975-10-28
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Expires: 1994-10-31
Abstract
Abstract Polarized electric contact blades are made of different widths having a different dimensional fold of metal for polarizing each blade.
Inventors
- 👤 Louis F J Pfeifer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:31
CPC Classifications
H; H01; H01R; H01R13/00; H01R13/64; H01R13/642; H01R43/00; H01R43/002; H01R43/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
152 words
A set of folded metal polarized blades for an electric plug comprising a narrow blade and a wide blade, each of said blades being defined by first and second longitudinal blade faces folded from a bend line, the first and second blade faces of said narrow blade each having inset portions only one on either side of said blade, each said narrow blade having a width of a nonpolarized blade measured from furthest edge to furthest edge of said blade, the first and second blade faces of said wide blade each having only one protruding portion on either side of said blade, each said wide blade having a width of a polarized blade measured from furthest edge to furthest edge of each of said blade protrusion, joint means whereby said blades may be maintained in a continuous strip, and crimping means on each blade to connect the blade to a line cord.
Claim 2
Dependent Claim
152 words
A set of folded metal polarized blades for an electric plug comprising a narrow blade and a wide blade, each of said blades being defined by first and second longitudinal blade faces folded from a bend line, the first and second blade faces of said narrow blade each having inset portions only one on either side of said blade, each said narrow blade having a width of a nonpolarized blade measured from furthest edge to furthest edge of said blade, the first and second blade faces of said wide blade each having only one protruding portion on either side of said blade, each said wide blade having a width of a polarized blade measured from furthest edge to furthest edge of each of said blade protrusion, joint means whereby said blades may be maintained in a continuous strip, and crimping means on each blade to connect the blade to a line cord.
Claim 3
Dependent Claim
22 words
The invention as claimed in claim 1 wherein each said narrow and wide blade insets and protrusions are interfitable in side-by-side relationship.
References Cited (Backward Citations)
US3149898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |