Patent US4020020A successfully refreshed from Google Patents.
US4020020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating waste sheet flooring
Assignee: Armstrong World Industries Inc
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Filing: 1975-06-17
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Granted: 1977-04-26
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Expires: 1995-06-17
Abstract
Abstract Scrap sheet floor covering is recovered for reuse through the use of a Banbury mixer. The mixer grinds pre-diced scrap and abrades away asbestos filler backing material from the vinyl wear layer material. Binder scrap or virgin resin and plasticizer is added to convert the scrap sheet floor material to a raw material for use in manufacturing fiber filled vinyl tile.
Inventors
- 👤 Francis J. Appleyard
- 👤 Stavros C. Stavrinou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:48
CPC Classifications
D; D06; D06N; D06N7/00; D06N7/0005; D06N7/0039; C; C08; C08J; C08J11/00; C08J11/04; C08J11/06; C08J11/08; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
137 words
A process for recovering scrap sheet floor covering material which is composed of a felted fibrous backing cured to a nonfibrous resin wear surface which comprises the steps of; a. dicing said scrap sheet floor covering to reduce it to small pieces, b. masticating the sheet floor covering pieces with an intense shearing action while under mechanical compression to grind up the fibrous backing and the resin wear surface for the purpose of comingling these materials, c. adding supplemental resin materials to the comingled mass of fibrous backing and resin wear surface materials to the point that a desired ratio of resin to fibrous material is secured in the resulting mass, and d. blending the resulting mass which now blended can be utilized as part of a new floor covering materials of blended fiber and resin material.
Claim 2
Dependent Claim
137 words
A process for recovering scrap sheet floor covering material which is composed of a felted fibrous backing cured to a nonfibrous resin wear surface which comprises the steps of; a. dicing said scrap sheet floor covering to reduce it to small pieces, b. masticating the sheet floor covering pieces with an intense shearing action while under mechanical compression to grind up the fibrous backing and the resin wear surface for the purpose of comingling these materials, c. adding supplemental resin materials to the comingled mass of fibrous backing and resin wear surface materials to the point that a desired ratio of resin to fibrous material is secured in the resulting mass, and d. blending the resulting mass which now blended can be utilized as part of a new floor covering materials of blended fiber and resin material.
Claim 3
Dependent Claim
40 words
The process of recovering scrap floor covering as set forth in claim 1 wherein said masticating of the fibrous backing and resin wear surface is carried out in a Banbury mixer until a mix temperature of 300° F. is reached.
Claim 4
Dependent Claim
29 words
The process for recovering scrap floor covering as set forth in claim 2 wherein said blending step is carried out until the mix temperature of 350° F. is reached.
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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |