US4091136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic cork-like material and method of making same
Assignee: HUNSINGER Inc WATER STREET & RD #1 E GREENVILLE PA A CORP OF
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Filing: 1976-05-17
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Granted: 1978-05-23
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Expires: 1996-05-17
Abstract
Abstract A synthetic cork-like material for use as a closure for liquid containers which is composed of a fine celled polyolefin foam containing an ionomer and which may be formed by a foaming process.
Inventors
- 👤 John C. O'Brien
- 👤 Herbert A. Ehrenfreund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:22
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; B; B65; B65D; B65D39/00; B65D39/0005; B65D39/0011; C08J9/36; C08J2323/00; C08J2323/02; C08J2423/00; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/18; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2978
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
Synthetic cork-like stoppers for liquid containers comprising a fine closed cell foam produced by extrusion in rod form of a foamable mixture of polyolefin and a foaming agent together with an ethylene/methacrylic acid copolymer based ionomer resin, the resulting ionomer modified foam rod having a matte outer surface and a substantially uniform density throughout its cross section of from 12 lbs/cu.ft. to 17 lbs/cu.ft. and a non-leveling coating of moisture impervious material impregnating said matte surface, said material having a substantially higher coefficient of friction than the surface of the foam per se.
Claim 2
Dependent Claim
93 words
Synthetic cork-like stoppers for liquid containers comprising a fine closed cell foam produced by extrusion in rod form of a foamable mixture of polyolefin and a foaming agent together with an ethylene/methacrylic acid copolymer based ionomer resin, the resulting ionomer modified foam rod having a matte outer surface and a substantially uniform density throughout its cross section of from 12 lbs/cu.ft. to 17 lbs/cu.ft. and a non-leveling coating of moisture impervious material impregnating said matte surface, said material having a substantially higher coefficient of friction than the surface of the foam per se.
Claim 3
Dependent Claim
46 words
Synthetic cork-like stoppers for liquid containers as set forth in claim 1 in which said polyolefin is a low density polyethylene from about 60 to 98% by weight of said mixture and said ionomer is present from about 0.5 to 35% by weight of said mixture.
Claim 4
Dependent Claim
19 words
Synthetic cork-like stoppers for liquid containers as set forth in claim 2 wherein said coating material includes bees wax.
Claim 5
Dependent Claim
29 words
Synthetic cork-like stoppers for liquid containers as set forth in claim 2 wherein said coating material comprises 10 to 30% by weight bees wax and 70 to 90% parafin.
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) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |