Patent US3898538A successfully refreshed from Google Patents.
US3898538A
Expired / Lapsed
US
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Anti-static footwear
Assignee: STAT E CON Pty Ltd
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Filing: 1973-12-12
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Granted: 1975-08-05
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Expires: 1993-12-12
Abstract
Abstract Anti-static footwear, having a member of substantially constant resistance conductively connecting the lower surface of the insole with an exposed face of the outer sole, wherein the resistance of the path between the foot of a wearer and ground remains substantially between a required upper limit and a required lower limit even if the insole should in use become a perfect conductor.
Inventors
- 👤 John Arthur Dalton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:59
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/14; A43; A43B; A43B7/00; A43B7/36
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
170 words
Anti-static footwear having an electrically insulating outer sole and an insole the resistance of which is liable to drop substantially upon absorption of moisture from the wearer''s foot, comprising a member of substantially constant resistance which conductively connects the lower surface of said insole with an exposed face of said outer sole such that when a wearer of said anti-static footwear stands upon the ground, the resistance of the total electrical path, between his foot within said footwear and said ground contacted by said exposed face of said outer sole, remains substantially between a required upper limit and a required lower limit, even if said insole should in use become a perfect conductor, said member comprising: A. a panel which contacts said lower surface of said insole and is thinner than said outer sole so that no part of said panel extends to or beyond said exposed face of said outer sole, and B. a conductive means which electrically connects said panel with said exposed face of said outer sole.
Claim 2
Dependent Claim
170 words
Anti-static footwear having an electrically insulating outer sole and an insole the resistance of which is liable to drop substantially upon absorption of moisture from the wearer''s foot, comprising a member of substantially constant resistance which conductively connects the lower surface of said insole with an exposed face of said outer sole such that when a wearer of said anti-static footwear stands upon the ground, the resistance of the total electrical path, between his foot within said footwear and said ground contacted by said exposed face of said outer sole, remains substantially between a required upper limit and a required lower limit, even if said insole should in use become a perfect conductor, said member comprising: A. a panel which contacts said lower surface of said insole and is thinner than said outer sole so that no part of said panel extends to or beyond said exposed face of said outer sole, and B. a conductive means which electrically connects said panel with said exposed face of said outer sole.
Claim 3
Dependent Claim
23 words
The footwear of claim 1 wherein said panel extends over a smaller area than the area of said insole and said outer sole.
Claim 4
Dependent Claim
19 words
The footwear of claim 2 whereiN said panel is located in the vicinity of the ball of said foot.
Claim 5
Dependent Claim
33 words
The footwear of claim 1 wherein said conductive means comprises metal threads in electrical communication with said panel and having at least one end extending to said exposed face of said outer sole.
Claim 6
Dependent Claim
20 words
The footwear of claim 4 wherein said metal threads are at least part of a piece of fine wire mesh.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |