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US4188769A
Expired / Lapsed
US
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Microwave sealing of thermoplastic material
Assignee: WR Grace and Co
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Filing: 1978-04-21
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Granted: 1980-02-19
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Expires: 1998-04-21
Abstract
Abstract Microwave energy is used for sealing polymeric film material particularly the sealing of film material in the form of flexible containers.
Inventors
- 👤 Marvin L. Bright, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:48
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/80; B29C66/84; B29C66/861; B29C65/00; B29C65/02; B29C65/14; B29C65/1403; B29C65/1425; B29C65/1487; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/4312; B29C66/43121; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B65; B65B; B65B51/00; B65B51/10; B65B51/22; B29C66/71; B29C66/72; B29C66/723; B29C66/735; B29C66/7352; B29C66/737; B29C66/7375; B29C66/73755; B29C66/73756; B29C66/7394; B29C66/73941; B29L; B29L2031/00; B29L2031/712; B29L2031/7128
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
67 words
A process for cohering film material comprising: gathering said film material into a compact configuration; placing said compact configuration within a standing wave guide; subjecting said compact configuration within said wave guide to microwave energy for a period of time sufficient to unify the film material within said compact configuration, said compact configuration having an effective diameter of less than one-half the wavelength of said microwave energy.
Claim 2
Dependent Claim
67 words
A process for cohering film material comprising: gathering said film material into a compact configuration; placing said compact configuration within a standing wave guide; subjecting said compact configuration within said wave guide to microwave energy for a period of time sufficient to unify the film material within said compact configuration, said compact configuration having an effective diameter of less than one-half the wavelength of said microwave energy.
Claim 3
Dependent Claim
19 words
The process according to claim 1 wherein said step of gathering comprises twisting said film material into a skein.
Claim 4
Dependent Claim
22 words
The process according to claim 1 wherein said microwave energy has a wave length of from 100 to 0.10 of a centimeter.
Claim 5
Dependent Claim
17 words
The process according to claim 1 wherein said microwave energy is at a frequency of 2,450 megahertz.
Claim 6
Dependent Claim
17 words
The process according to claim 1 wherein said film material is in the form of a container.
Claim 7
Dependent Claim
18 words
The process according to claim 1 wherein said film material is comprised of a polymer of an olefin.
Claim 8
Dependent Claim
12 words
The process according to claim 6 wherein said olefin polymer is polyethylene.
Claim 9
Dependent Claim
42 words
The process according to claim 1 wherein said material is a material selected from a group consisting of olefin polymers, copolymers of olefins, copolymers of vinylidene chloride and vinyl chloride, polymers of amides, styrene polymers, and copolymers of ethylene and vinyl esters.
Claim 10
Dependent Claim
78 words
A process of packaging comprising: placing an article within a flexible container; gathering the opening of said container into a compact configuration; placing said compact configuration within a standing wave guide; and subjecting said compact configuration within said wave guide to a source of microwave energy for a period of time sufficient to unify said compact configuration into a unitary closure, said compact configuration having an effective diameter of less than one-half the wavelength of said microwave energy.
Claim 11
Dependent Claim
78 words
A process of packaging comprising: placing an article within a flexible container; gathering the opening of said container into a compact configuration; placing said compact configuration within a standing wave guide; and subjecting said compact configuration within said wave guide to a source of microwave energy for a period of time sufficient to unify said compact configuration into a unitary closure, said compact configuration having an effective diameter of less than one-half the wavelength of said microwave energy.
Claim 12
Dependent Claim
21 words
The process according to claim 9 wherein said step of gathering comprises twisting the container opening to form a skein configuration.
Claim 13
Dependent Claim
20 words
The process according to claim 9 further including the step of evacuating said container prior to said step of gathering.
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) | 1983-02-18 | 1983-08-20 | 1984-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-18 | 1987-08-20 | 1988-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-18 | 1991-08-20 | 1992-02-19 | $7700.00 | Window Closed / Lapsed |