US4310367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sealing an item in a covering comprising a composition of a polyethylene and isobutylene copolymer
Assignee: Radiation Dynamics Inc
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Filing: 1980-04-03
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Granted: 1982-01-12
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Expires: 2000-04-03
Abstract
Abstract Cross-linkable polyethylene blended with a copolymer of isobutylene and a conjugated diene is capable of being crosslinked, bonded, stretched and recovered without a significant loss of strength characteristics or seal.
Inventors
- 👤 Anthony J. Berejka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:17
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; B; B29; B29C; B29C61/00; B29C61/003; B29C65/00; B29C65/02; B29C66/00; B29C66/70; B29C66/71; B29C66/73; B29C66/737; B29C66/7371; B29C66/73711; B29C66/7375; B29C66/73755; B29C66/73756; B29C66/739; B29C66/7394; B29C66/73941; C08L23/18; C08L23/20; C08L23/22; C08L23/26; B29C35/00; B29C35/02; B29C35/08; B29C35/0866; B29C2035/0877; B29C65/08; B29C65/14; B29C65/66; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29K; B29K2009/00; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0608; B29K2023/0633; B29K2023/065; B29K2023/18; B29K2023/22; B29K2105/00; B29K2105/0005; B29K2105/0085; B29K2105/0088; B29K2105/24; Y; Y10; Y10T; Y10T428/00; Y10T428/19
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
141 words
A method of sealing an item in a covering comprising: (a) forming a sheet or film of material of a composition comprising a cross-linkable polyethylene and a copolymer of isobutylene and conjugated diene wherein a sufficient quantity of isobutylene copolymer to render the sheet or film heat sealable or sealable onto itself or other polyolefin compositions, (b) irradiating said sheet or film thereby to cross-link the polyethylene, (c) heating said sheet or film to a temperature above its crystalline softening point, (d) stretching said sheet or film and cooling it while stretched so as to establish the stretched dimension, (e) wrapping said item in said sheet or film, (f) heat sealing the seams of said wrap, and (g) heating said sheet to a temperature above its crystalline softening point thereby to cause recovery of the sheet dimension to a lesser dimension.
Claim 2
Independent Claim
141 words
A method of sealing an item in a covering comprising: (a) forming a sheet or film of material of a composition comprising a cross-linkable polyethylene and a copolymer of isobutylene and conjugated diene wherein a sufficient quantity of isobutylene copolymer to render the sheet or film heat sealable or sealable onto itself or other polyolefin compositions, (b) irradiating said sheet or film thereby to cross-link the polyethylene, (c) heating said sheet or film to a temperature above its crystalline softening point, (d) stretching said sheet or film and cooling it while stretched so as to establish the stretched dimension, (e) wrapping said item in said sheet or film, (f) heat sealing the seams of said wrap, and (g) heating said sheet to a temperature above its crystalline softening point thereby to cause recovery of the sheet dimension to a lesser dimension.
Claim 3
Dependent Claim
13 words
A method according to claim 1 wherein said recovery is at least 25%.
Claim 4
Dependent Claim
35 words
A method according to claim 1 wherein said recovery is sufficient to be to a dimension less than that of the wrapped item and thereby is restrained under stress by the size of said item.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein irradiation is at a dosage of about 2-5 megarads.
References Cited (Backward Citations)
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Cited
US3087845A
Cited
US3262997A
Cited
US3819574A
Cited
US3775387A
Cited
US3816371A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-11 | 1985-07-13 | 1986-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-11 | 1989-07-13 | 1990-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-11 | 1993-07-13 | 1994-01-12 | $7700.00 | Window Closed / Lapsed |