Patent US3879247A successfully refreshed from Google Patents.
US3879247A
Expired / Lapsed
US
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Method of heat sealing and holding package closure elements
Assignee: Harrington-Research Corp
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Filing: 1973-04-02
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Granted: 1975-04-22
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Expires: 1993-04-02
Abstract
Abstract A method of heat-sealing packages is provided wherein elements thereof to be sealed are heated and held by the combined heating and holding action of magnetic susceptible particles subjected to alternating current and to such method wherein a heat softenable sealing material comprises a thermoplastic adhesive added to the elements of the package to be sealed, or the softenable material may comprise the packaging per se.
Inventors
- 👤 John W Dickey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:23
CPC Classifications
B; B65; B65B; B65B51/00; B65B51/10; B65B51/22; B65B51/227; B29; B29C; B29C65/00; B29C65/02; B29C65/34; B29C65/36; B29C65/3604; B29C65/3608; B29C65/3612; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/4312; B29C66/43121; B29C66/45; B29C66/80; B29C66/82; B29C66/824; B29C66/8244; B29C66/83; B29C66/834; B29C66/8341; B29C66/83421; B29C66/83423; B29C65/3668; B29C65/3672; B29C65/3676; B29C65/368; B29C66/47; B29C66/472; B29C66/4722; B29C66/70; B29C66/71; Y; Y10; Y10S; Y10S53/00; Y10S53/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
106 words
A method of heat sealing a pair of closure elements of a package wherein at least one of said elements of the pair includes a heat softenable material and at least one of said elements of the pair includes magnetic susceptible material comprising heating said pair of elements to soften the heat softenable material and while softened holding said pair of elements under internal pressure therebetween until the heat softened material has hardened by subjecting said elements to a high frequency alternating current to soften the heat softenable material and low frequency alternating current producing magnetic fields to hold said pair of elements under internal pressure.
Claim 2
Independent Claim
106 words
A method of heat sealing a pair of closure elements of a package wherein at least one of said elements of the pair includes a heat softenable material and at least one of said elements of the pair includes magnetic susceptible material comprising heating said pair of elements to soften the heat softenable material and while softened holding said pair of elements under internal pressure therebetween until the heat softened material has hardened by subjecting said elements to a high frequency alternating current to soften the heat softenable material and low frequency alternating current producing magnetic fields to hold said pair of elements under internal pressure.
Claim 3
Independent Claim
106 words
A method of heat sealing a pair of closure elements of a package wherein at least one of said elements of the pair includes a heat softenable material and at least one of said elements of the pair includes magnetic susceptible material comprising heating said pair of elements to soften the heat softenable material and while softened holding said pair of elements under internal pressure therebetween until the heat softened material has hardened by subjecting said elements to a high frequency alternating current to soften the heat softenable material and low frequency alternating current producing magnetic fields to hold said pair of elements under internal pressure.
Claim 4
Independent Claim
106 words
A method of heat sealing a pair of closure elements of a package wherein at least one of said elements of the pair includes a heat softenable material and at least one of said elements of the pair includes magnetic susceptible material comprising heating said pair of elements to soften the heat softenable material and while softened holding said pair of elements under internal pressure therebetween until the heat softened material has hardened by subjecting said elements to a high frequency alternating current to soften the heat softenable material and low frequency alternating current producing magnetic fields to hold said pair of elements under internal pressure.
Claim 5
Dependent Claim
22 words
The invention defined in claim 1 wherein the first of the pair of elements includes magnetic susceptible material and heat softenable material.
Claim 6
Dependent Claim
36 words
The invention defined in claim 1 wherein the first of the pair of elements includes magnetic susceptible material and heat softenable material and wherein the second of the pair of elements includes only heat softenable material.
Claim 7
Dependent Claim
36 words
The invention defined in claim 1 wherein the first of the pair of elements includes magnetic susceptible material and heat softenable material and wherein the second of the pair of elements includes only magnetic susceptible material.
Claim 8
Dependent Claim
21 words
The invention defined in claim 1 wherein each of the pair of elements includes magnetic susceptible material and heat softenable material.
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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |