Patent US4858504A successfully refreshed from Google Patents.
US4858504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screwdriver with insulated shaft and polygonal driving head
Assignee: Individual
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Filing: 1988-08-01
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Granted: 1989-08-22
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Expires: 2008-08-01
Abstract
Abstract A screwdriver with insulated shaft and polygonal driving head comprising an insulated block disposed between a shaft and a polygonal head. A handle of insulated material is engaged on the shaft, so that the screwdriver accordingly is insulated and an operator of the screwdriver can be protected from electric shock.
Inventors
- 👤 Jame Tsai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:19
CPC Classifications
B; B25; B25B; B25B23/00; B25B23/16; B25B15/00; B25B15/02; B25G; B25G1/00; B25G1/10; B25G1/12; B25G1/125
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A screwdriver with insulated shaft and polygonal driving head comprising: a shaft with a blade end and a polygonal end; an insulated block having a polygonal recess which receives said polygonal end of said shaft; a polygonal head having a polygonal recess which receives said insulated block and a slot on the perimeter of said polygonal head; and a handle having a centrally axial essentially cylindrical opening to receive said shaft, insulated block and polygonal head and a flange to engage with said slot of said polygonal head; an upper portion of said polygonal head and a lower portion of said shaft, respectively, extending from said opening of said handle.
Claim 2
Dependent Claim
110 words
A screwdriver with insulated shaft and polygonal driving head comprising: a shaft with a blade end and a polygonal end; an insulated block having a polygonal recess which receives said polygonal end of said shaft; a polygonal head having a polygonal recess which receives said insulated block and a slot on the perimeter of said polygonal head; and a handle having a centrally axial essentially cylindrical opening to receive said shaft, insulated block and polygonal head and a flange to engage with said slot of said polygonal head; an upper portion of said polygonal head and a lower portion of said shaft, respectively, extending from said opening of said handle.
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) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |