Patent US4451321A successfully refreshed from Google Patents.
US4451321A
Expired / Lapsed
US
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Flexible vacuum bag
Assignee: Shatterproof Glass Corp
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Filing: 1983-02-16
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Granted: 1984-05-29
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Expires: 2003-02-16
Abstract
Abstract A flexible vacuum bag for use in the lamination of glass sheets with an interposed layer of thermoplastic material, said bag having one initially open edge through which the laminations are introduced, and magnetic means for sealing said open edge to render the bag airtight during the laminating process.
Inventors
- 👤 Harold E. McKelvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:08
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/32; B29C43/36; B29C43/3607; B32; B32B; B32B38/00; B32B38/18; B32B38/1858; B29C43/3642; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10807; B32B17/10816; B32B17/10825; B32B17/10834; B32B17/10844; B32B17/10853; B29C2043/3205; B29C2043/3211; B29C2043/3644; B29C43/02; B29C43/20; B29C43/203; B29C43/206; B29K; B29K2709/00; B29K2709/08; B32B37/00; B32B37/10; B32B2037/1081; B32B2309/00; B32B2309/60; B32B2309/68; B32B2329/00; B32B2329/06; B32B2605/00; B32B2605/08; Y; Y10; Y10T; Y10T24/00; Y10T24/15; Y10T24/32
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
130 words
A flexible vacuum bag for use in the lamination of glass sheets with an interposed layer of thermoplastic material, comprising opposite flexible side panels secured together along their edges but having one side edge open to receive the laminations, and magnetic means for sealing said initially open edge to render the bag airtight, said magnetic means including a pair of spaced, parallel, flexible metal strips disposed opposite the outer surface of one of said panels, two rows of permanent magnets secured in spaced relation along said strips, with the magnets in the two rows disposed opposite one another, means magnetically connecting the opposite magnets in the two rows, and a flexible metal strip secured to the inner surface of the second panel opposite the metal strips on the first panel.
Claim 2
Dependent Claim
130 words
A flexible vacuum bag for use in the lamination of glass sheets with an interposed layer of thermoplastic material, comprising opposite flexible side panels secured together along their edges but having one side edge open to receive the laminations, and magnetic means for sealing said initially open edge to render the bag airtight, said magnetic means including a pair of spaced, parallel, flexible metal strips disposed opposite the outer surface of one of said panels, two rows of permanent magnets secured in spaced relation along said strips, with the magnets in the two rows disposed opposite one another, means magnetically connecting the opposite magnets in the two rows, and a flexible metal strip secured to the inner surface of the second panel opposite the metal strips on the first panel.
Claim 3
Dependent Claim
35 words
A flexible vacuum bag as claimed in claim 1, including sealing means carried by said second panel and engaging said first panel between said metal strips on the first panel when the bag is closed.
Claim 4
Dependent Claim
83 words
A flexible vacuum bag for use in the lamination of glass sheets with an interposed layer of thermoplastic material, comprising opposite flexible side panels secured together along their edges but having one edge open to receive the laminations, and magnetic means for sealing said initially open edge to render the bag airtight, said magnetic means including flexible metal strips carried by said panels opposite one another, and a plurality of individual permanent magnets carried by the metal strips on one of said panels.
Claim 5
Dependent Claim
83 words
A flexible vacuum bag for use in the lamination of glass sheets with an interposed layer of thermoplastic material, comprising opposite flexible side panels secured together along their edges but having one edge open to receive the laminations, and magnetic means for sealing said initially open edge to render the bag airtight, said magnetic means including flexible metal strips carried by said panels opposite one another, and a plurality of individual permanent magnets carried by the metal strips on one of said panels.
Claim 6
Dependent Claim
32 words
A flexible vacuum bag as claimed in claim 3, including a sealing material secured to one of said panels and engaging the other panel in sealing relation when the bag is closed.
Claim 7
Dependent Claim
153 words
A flexible vacuum bag for use in the lamination of glass sheets with an interposed layer of thermoplastic material, comprising opposite flexible side panels secured together along their edges but having one edge open to receive the laminations, and magnetic means for sealing said initially open edge to render the bag airtight, said magnetic means including a pair of spaced, parallel, flexible metal strips disposed opposite the outer surface of one of said panels, permanent magnets secured in spaced relation along said strips, with the magnets on the two strips being disposed opposite one another, shunt strips secured to the opposite magnets, a flexible metal strip secured to the inner surface of the second panel opposite the metal strips on the first panel and coextensive in length therewith, and a strip of sealing material secured to the metal strip on the second panel and engaging the first panel when the bag is closed.
Claim 8
Dependent Claim
153 words
A flexible vacuum bag for use in the lamination of glass sheets with an interposed layer of thermoplastic material, comprising opposite flexible side panels secured together along their edges but having one edge open to receive the laminations, and magnetic means for sealing said initially open edge to render the bag airtight, said magnetic means including a pair of spaced, parallel, flexible metal strips disposed opposite the outer surface of one of said panels, permanent magnets secured in spaced relation along said strips, with the magnets on the two strips being disposed opposite one another, shunt strips secured to the opposite magnets, a flexible metal strip secured to the inner surface of the second panel opposite the metal strips on the first panel and coextensive in length therewith, and a strip of sealing material secured to the metal strip on the second panel and engaging the first panel when the bag is closed.
Claim 9
Dependent Claim
20 words
A flexible vacuum bag as claimed in claim 5, in which the bag panels are formed of a plastic material.
Claim 10
Dependent Claim
20 words
A flexible vacuum bag as claimed in claim 5, including means for withdrawing the air from said bag after sealing.
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) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |