Patent US4176975A successfully refreshed from Google Patents.
US4176975A
Expired / Lapsed
US
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Metalloid filament wire matrix print head
Assignee: International Business Machines Corp
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Filing: 1977-12-05
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Granted: 1979-12-04
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Expires: 1997-12-05
Abstract
Abstract A wire matrix print head mechanism is disclosed in which a wear and impact resistant, flexible, smooth, tough and economical metalloid element filament material is utilized as the impact print wire. The wire material's flexibility eliminates many of the problems of breakage and brittleness failures encountered in previous designs. The lower coefficient of friction and greater smoothness of the wire material lowers the magnet forces required to push the wires through wire guides in the print head. The extreme hardness of the metalloid material combined with its high flexibility and toughness facilitate the production of impact and wear resistant, easily assembled long life wire matrix print heads.
Inventors
- 👤 Wentzle R. DeBoskey
- 👤 Robert A. Sebrosky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:21
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/22; B41J2/23; B41J2/235; B41J2/25; B41J2/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
64 words
An improved dot matrix printer apparatus having at least one print wire means for impacting a medium to form a mark, at least one electromagnetic print wire driver operably connected with said print wire means for axially reciprocating the same to impact said medium wherein said improvement comprises: said print wire means being at least one continuous unitary filament of elemental metalloid material boron.
Claim 2
Dependent Claim
64 words
An improved dot matrix printer apparatus having at least one print wire means for impacting a medium to form a mark, at least one electromagnetic print wire driver operably connected with said print wire means for axially reciprocating the same to impact said medium wherein said improvement comprises: said print wire means being at least one continuous unitary filament of elemental metalloid material boron.
Claim 3
Dependent Claim
26 words
Apparatus as described in claim 1, wherein: said metalloid has a modulus of elasticity of approximately 50×10 6 PSI and a hardness of approximately 3,000 DPH.
Claim 4
Dependent Claim
64 words
An improved dot matrix printer apparatus having at least one print wire means for impacting a medium to form a mark, at least one electromagnetic print wire driver operably connected with said print wire means for axially reciprocating the same to impact said medium wherein said improvement comprises: said print wire means being at least one continuous unitary filament of elemental metalloid material carbon.
Claim 5
Dependent Claim
64 words
An improved dot matrix printer apparatus having at least one print wire means for impacting a medium to form a mark, at least one electromagnetic print wire driver operably connected with said print wire means for axially reciprocating the same to impact said medium wherein said improvement comprises: said print wire means being at least one continuous unitary filament of elemental metalloid material carbon.
References Cited (Backward Citations)
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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) | 1982-12-03 | 1983-06-04 | 1983-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-03 | 1987-06-04 | 1987-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-03 | 1991-06-04 | 1991-12-04 | $7700.00 | Window Closed / Lapsed |