Patent US4451586A successfully refreshed from Google Patents.
US4451586A
Expired / Lapsed
US
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Process and apparatus for manufacturing flame retardant flexible foamed articles
Assignee: NOMACO WEST Inc A NORTH CAROLINA Corp
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Filing: 1982-06-30
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Granted: 1984-05-29
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Expires: 2002-06-30
Abstract
Abstract Process and apparatus are disclosed for manufacturing foamed articles such as tubes used as pipe insulation, which tubes are of a high impermeability and flexibility and are formed of a polymer, such as polyethylene or polypropylene, containing up to about 25% of an elastomer.
Inventors
- 👤 Alonzo H. Searl
- 👤 Granville J. Hahn
- 👤 Raleigh N. Rutledge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:22
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; B; B29; B29C; B29C44/00; B29C44/34; B29C44/3442; F; F16; F16L; F16L59/00; F16L59/02; F16L59/021; C08J2423/00; Y; Y10; Y10S; Y10S260/00; Y10S260/24; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
51 words
A foamed fire-retardant polymer article having improved impermeability and flexibility, said article comprising: a polymer exhibiting high impermeability; an elastomer blended with said polymer and having a solubility parameter close to that of said polymer; a fire-retardant blended with said polymer and elastomer; and, said polymer/elastomer/fire-retardant blend having a closed-cell structure.
Claim 2
Dependent Claim
51 words
A foamed fire-retardant polymer article having improved impermeability and flexibility, said article comprising: a polymer exhibiting high impermeability; an elastomer blended with said polymer and having a solubility parameter close to that of said polymer; a fire-retardant blended with said polymer and elastomer; and, said polymer/elastomer/fire-retardant blend having a closed-cell structure.
Claim 3
Dependent Claim
16 words
The polymer article of claim 1 wherein said polymer is polyethylene and said elastomer is polyisobutylene.
Claim 4
Dependent Claim
18 words
The polymer article of claim 1 wherein said polymer is polypropylene and said elastomer is the copolymer, ethylene-propylene.
Claim 5
Dependent Claim
14 words
The polymer article of claim 2 or claim 3 wherein said fire-retardant is decabromodiphenyloxide.
Claim 6
Dependent Claim
14 words
The polymer article of claim 2 or claim 3 wherein said fire-retardant is pentabromodiphenyloxide.
Claim 7
Dependent Claim
56 words
The polymer article of claim 2 or claim 3 wherein said polymer is present in an amount of from about 70 to about 95 percent by weight, said elastomer is present in an amount of about 30 to about 5 percent by weight, and said fire-retardant is slected from the group consisting of decabromodiphenyloxide and pentabromodiphenyloxide.
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) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |