Patent US3678933A successfully refreshed from Google Patents.
US3678933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surgical sponge or bandage
Assignee: Moore Perk Corp
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Filing: 1970-07-17
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Granted: 1972-07-25
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Expires: 1990-07-17
Abstract
Abstract Layers of thin thermoplastic film are brought into contact with opposite surfaces of superposed layers of absorbent material, such as sheets of fibrous crepe paper of facial quality, rayon fibers, or flexible polyurethane foam. The layers of plastic film are covered with a loosely-woven cotton scrim or gauze (or with spun-bonded nylon). Additional layers of the thin plastic film may then cover the exterior surfaces of the scrim layers. The multi-layer article thus formed is then compressed and heated to melt the plastic films. The melted plastic bonds the scrim to the paper, separating as it melts to communicate the absorbent paper core with the exterior of the pad and to gather itself about the threads of the scrim in wrapping, covering engagement. The resultant pad is highly absorbent upon contact with a liquid, yet the absorbed liquid will not ''''bleed'''' back from the pad thus making it highly desirable as a surgical sponge or bandage.
Inventors
- 👤 Francis C Moore
- 👤 Leon A Perkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:34
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/01; A61F13/01021; A61F13/01029; A61F13/15; A61F13/20; A61F13/34; A61F13/53; A61F13/534; A61F2013/00089; A61F2013/00157; A61F2013/00238; A61F2013/00242; A61F2013/00348; A61F2013/00361; A61F2013/00365; A61F2013/00519; A61F13/15577; A61F2013/15821; A61F13/51; A61F13/511; A61F2013/51186; A61F13/513; A61F2013/51355; A61F2013/530131; A61F2013/530182; A61F2013/530802; A61F2013/53445; A61F13/539; A61F2013/5395; A61F2013/53958; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24446; Y10T428/24455; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
64 words
The article of claim 1 further comprising third and fourth layers of thermoplastic film material covering respectively the outer surfaces of said first and second layers of flexible grid material and heat sealed against the same to cover the exposed surface of said grid material and unite with the intermediate layers of thermoplastic film in gathering loose thread and lint attached to said article.
Claim 2
Dependent Claim
18 words
The article of claim 1 wherein said central core material is soft fibrous crepe paper of facial quality.
Claim 3
Dependent Claim
24 words
The article of claim 2 wherein said four layers of thermoplastic material are polyethylene film having a thickness between 0.0001 in. to 0.01 in.
Claim 4
Dependent Claim
27 words
The article of claim 1 wherein said grid material is a scrim formed of loosely-woven intersecting cotton fibers extending in orthogonal directions to provide said closed boundaries.
Claim 5
Dependent Claim
15 words
The article of claim 4 wherein the thickness of said polyethylene film is 0.0002 in.
Claim 6
Dependent Claim
25 words
The article of claim 6 wherein said plastic film is corona-discharge treated to provide a better bonding between said grid material and said core material.
Claim 7
Dependent Claim
25 words
The article of claim 6 wherein said plastic film is flame treated to provide a better bonding between said grid material and said core material.
Claim 8
Dependent Claim
50 words
The article of claim 1 wherein said core material is shorter than said other layers to provide a peripheral border of said grid material bonded directly together by means of said plastic material to provide a plastic-coated peripheral edge of said core material thereby preventing the escape of lint therefrom.
Claim 9
Dependent Claim
12 words
The article of claim 1 wherein said grid material is spun-bonded nylon.
Claim 10
Dependent Claim
17 words
The article of claim 1 wherein said core material is a soft, flexible, highly-absorbent, open-cell polyurethane foam.
Claim 11
Dependent Claim
175 words
In a surgical sponge or dressing, the combination comprising at least first and second contiguous layers of soft fibrous, highly-absorbent paper providing a core layer; first and second layers of tear-resistant grid sheet material comprising a plurality of filaments interconnected in spaced locations covering respectively the exposed surfaces of said core material and providing a plurality of closed boundaries each defining an aperture, said grid material extending beyond the periphery of said core material; first and second layers of polyethylene interposed respectively between said core material and said first and second grid layers and heat-sealed therebetween to bond said grid layers to said core material and to each other beyond the perimeter of said core material; and third and fourth layers of polyethylene covering respectively the outer surfaces of said grid layers, all of said polyethylene film layers being heated and pressed against said scrim layers to rupture within most of the closed boundaries defined thereby, said plastic films separating from itself at the point of rupture and encompassing the grid filaments in wrapping engagement.
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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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |