US3684922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-static plastic shoe cover and method of making same
Assignee: Elliot Laboratories Inc
•
Filing: 1971-08-02
•
Granted: 1972-08-15
•
Expires: 1991-08-02
Abstract
Abstract A shoe cover adapted to be worn over other footwear by operating room personnel, including physicians and nurses, the cover having electrically conductive surface portions disposed to ground the bodies of wearers to the floor and thus prevent the build-up of static-electric charges which might cause a spark near explosive gases, the cover being formed from flat sheets of plastic material sealed together and cut along lines defining the front and rear edges of the cover and a bottom line defining one edge of an integral connecting strip, and being also sealed and scored (weakened) along a line parallel to said bottom line which defines the lower edge of the shoe cover and the upper edge of the connecting strip, said strip and an adjacent portion of the cover being rendered conductive by the application thereto of a conductive surface coating. The double sealed and scored line stops short of the rear edge and the cover is prepared for use by tearing strip along the scored line to the end thereof, whereby the strip is available to be tucked into the heel of the wearer''s shoe to provide a continuous conductive path from the foot, along the surface of the strip to the adjacent conductive surface area of the cover and thence to the floor.
Inventors
- 👤 Richard E Ericson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:34
CPC Classifications
A; A43; A43B; A43B3/00; A43B3/16; A43B3/163
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
155 words
An anti-static plastic shoe cover comprising two flat sheets of thermoplastic material heat-sealed together along lines defining the front and rear edges of the cover and along a bottom line, being also sealed together along a line slightly spaced from said bottom line and being effectively weakened throughout the space between said bottom line and said spaced line, the bottom line being a continuation rearward of the front edge line, and terminating at a distance from the rear edge line, the spaced line and the weakened area also terminating adjacent the point of termination of the bottom line, and the sheets being cut along a line extending from the bottom of the rear edge line forward substantially parallel to said spaced line throughout the length of the spaced line, at least one of said sheets having applied to its surface in the region of said bottom line, spaced line and parallel line, a conductive coating.
Claim 2
Dependent Claim
155 words
An anti-static plastic shoe cover comprising two flat sheets of thermoplastic material heat-sealed together along lines defining the front and rear edges of the cover and along a bottom line, being also sealed together along a line slightly spaced from said bottom line and being effectively weakened throughout the space between said bottom line and said spaced line, the bottom line being a continuation rearward of the front edge line, and terminating at a distance from the rear edge line, the spaced line and the weakened area also terminating adjacent the point of termination of the bottom line, and the sheets being cut along a line extending from the bottom of the rear edge line forward substantially parallel to said spaced line throughout the length of the spaced line, at least one of said sheets having applied to its surface in the region of said bottom line, spaced line and parallel line, a conductive coating.
Claim 3
Dependent Claim
38 words
A shoe cover according to claim 1 wherein said sheets are sealed together along said parallel line, which line is a continuation of the rear edge line and is connected at its forward end to said spaced line.
Claim 4
Dependent Claim
48 words
A shoe cover according to claim 1 wherein the conductive coating is applied to the outer surface of both sheets throughout a zone extending from the front edge to the rear edge and from the parallel line to a boundary line above the bottom line and spaced therefrom.
Claim 5
Dependent Claim
32 words
A shoe cover according to claim 1 which includes retention means attached at a point adjacent the front seal line and adapted to be passed around the rear edge of the cover.
Claim 6
Independent Claim
148 words
The method of making plastic shoe covers which includes, providing webs of heat-sealable plastic sheeting, bringing together said webs in face-to-face relation, providing a die having at least one die face rolled in the desired shoe cover configuration with the bottom edge rule line extending from the front edge to a point spaced from the rear edge and with an additional rule line extending from the rear edge to a point spaced from the front edge and connected to the bottom edge rule line near its front end, sealing said webs along said rule lines, weakening said sealed webs along all peripheral rule lines for easy separation of the shoe covers from adjacent web areas, weakening to a lesser degree the bottom edge rule line, and applying to at least one web surface a conductive coating in an area lying on both sides of the bottom rule line.
Claim 7
Independent Claim
148 words
The method of making plastic shoe covers which includes, providing webs of heat-sealable plastic sheeting, bringing together said webs in face-to-face relation, providing a die having at least one die face rolled in the desired shoe cover configuration with the bottom edge rule line extending from the front edge to a point spaced from the rear edge and with an additional rule line extending from the rear edge to a point spaced from the front edge and connected to the bottom edge rule line near its front end, sealing said webs along said rule lines, weakening said sealed webs along all peripheral rule lines for easy separation of the shoe covers from adjacent web areas, weakening to a lesser degree the bottom edge rule line, and applying to at least one web surface a conductive coating in an area lying on both sides of the bottom rule line.
Claim 8
Dependent Claim
16 words
The method according to claim 5 wherein the conductive coating is applied to both web surfaces.
Claim 9
Dependent Claim
22 words
The method according to claim 5 which includes separating the shoe covers from adjacent web areas and thereafter applying said conductive coating.
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |