Patent US4743636A successfully refreshed from Google Patents.
US4743636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing compound comprising cork powder and talc fillers
Assignee: WR Grace and Co Conn
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Filing: 1986-05-09
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Granted: 1988-05-10
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Expires: 2006-05-09
Abstract
Abstract A PVC-free sealing compound, particularly a sealing compound for use on containers, comprising a mixture of low density polyethylene or linear low density polyethylene; a styrene-isoprene-styrene block copolymer or a thermoplastic elastomeric blend of an ethylene-propylene copolymer such as EPM or EPDM, EVA and process oil, one or more fillers such as talc, and optionally cork powder.
Inventors
- 👤 Bruno Bersano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:09
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/10; C09J; C09J123/00; C09J123/02; C09J123/04; C09J153/00; C09J153/02; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/04; C08L2666/24; C09K2200/00; C09K2200/02; C09K2200/0239; C09K2200/0243; C09K2200/0252; C09K2200/026; C09K2200/06; C09K2200/0605; C09K2200/0615; C09K2200/0617; C09K2200/062; C09K2200/0642
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
59 words
A sealing compound for use on container closures consisting of: a. From about 75 to about 95 parts by weight of polyethylene; b. From about 10 to about 20 parts by weight of a styrene-isoprene-styrene block copolymer; and c. From about 15 to about 50 parts by weight of a mixture of fillers consisting of talc and cork powder.
Claim 2
Dependent Claim
59 words
A sealing compound for use on container closures consisting of: a. From about 75 to about 95 parts by weight of polyethylene; b. From about 10 to about 20 parts by weight of a styrene-isoprene-styrene block copolymer; and c. From about 15 to about 50 parts by weight of a mixture of fillers consisting of talc and cork powder.
Claim 3
Dependent Claim
24 words
The sealing compound of claim 1 wherein the polyethylene is selected from the group consisting of low density polyethylene and linear low density polyethylene.
Claim 4
Dependent Claim
22 words
The sealing compound of claim 1 wherein the styrene content of the styrene-isoprene-styrene block copolymer is from about 10 to about 40%.
Claim 5
Dependent Claim
41 words
The sealing compound of claim 1 wherein the amount of polyethylene is 85 parts by weight, the amount of block copolymer is 15 parts by weight, and the amount of filler is from about 20 to about 40 parts by weight.
Claim 6
Dependent Claim
49 words
A sealing compound for use on container closures consisting of: a. about 85 parts by weight of polyethylene; b. about 15 parts by weight of a styrene-isoprene-styrene block copolymer; and c. from about 20 to about 40 parts by weight of of a mixture of cork powder and talc.
Claim 7
Dependent Claim
49 words
A sealing compound for use on container closures consisting of: a. about 85 parts by weight of polyethylene; b. about 15 parts by weight of a styrene-isoprene-styrene block copolymer; and c. from about 20 to about 40 parts by weight of of a mixture of cork powder and talc.
Claim 8
Dependent Claim
24 words
A sealing compound of claim 5 wherein the polyethylene is selected from the group consisting of low density polyethylene and linear low density polyethylene
Claim 9
Dependent Claim
82 words
A sealing compound consisting of: a. from about 75 to about 95 parts by weight of polyethylene selected from the group consisting of low density polyethylene and linear low density polyethylene; b. from about 10 to about 20 parts by weight of a styrene-isoprene-styrene block copolymer wherein the styrene content in the copolymer is from about 10 to about 40%; and c. from about 15 to about 50 parts by weight of a mixture of fillers consisting of talc, and cork powder.
Claim 10
Dependent Claim
82 words
A sealing compound consisting of: a. from about 75 to about 95 parts by weight of polyethylene selected from the group consisting of low density polyethylene and linear low density polyethylene; b. from about 10 to about 20 parts by weight of a styrene-isoprene-styrene block copolymer wherein the styrene content in the copolymer is from about 10 to about 40%; and c. from about 15 to about 50 parts by weight of a mixture of fillers consisting of talc, and cork powder.
Claim 11
Dependent Claim
41 words
A sealing compound of claim 7 wherein the amount of polyethylene is 85 parts by weight, the amount of block copolymer is 15 parts by weight and the amount of fillers is from about 20 to about 40 parts by weight.
Claim 12
Dependent Claim
22 words
A sealing compound of claim 7 wherein the fillers are 40 parts by weight talc and 10 parts by weight cork powder.
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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) | 1991-05-10 | 1991-11-09 | 1992-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-10 | 1995-11-09 | 1996-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-10 | 1999-11-09 | 2000-05-10 | $7700.00 | Window Closed / Lapsed |