Patent US5138750A successfully refreshed from Google Patents.
US5138750A
Expired / Lapsed
US
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Zipper for reclosable thermoplastic bag
Assignee: DowBrands Inc
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Filing: 1991-05-13
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Granted: 1992-08-18
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Expires: 2011-05-13
Abstract
Abstract A zipper closure for a reclosable thermoplastic bag includes two opposing interlockable rib and groove profiles, wherein at least a part of one or both of the profiles is divided into segments of materials having different elastic moduli. The zipper provides an audibly and/or tactilely perceptible indication of proper interlocking of the profiles.
Inventors
- 👤 Douglas P. Gundlach
- 👤 Michael J. Banco
- 👤 Larry R. Erickson
- 👤 Marvin J. Kreh
- 👤 William A. Kirksey
- 👤 William E. Leboeuf
- 👤 Kevin J. Wagers
- 👤 John O. McCree
- 👤 Brian C. Dais
- 👤 Jose Porchia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:26
CPC Classifications
B; B65; B65D; B65D33/00; B65D33/16; B65D33/25; B65D33/2508; B65D33/2541; B65D33/2558; B65D33/255; A; A44; A44B; A44B19/00; A44B19/10; A44B19/16; Y; Y10; Y10S; Y10S24/00; Y10S24/30; Y10S24/50; Y10T; Y10T24/00; Y10T24/25; Y10T24/2539; Y10T24/45; Y10T24/45152; Y10T24/45157; Y10T24/45168
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
77 words
A zipper closure for a reclosable thermoplastic bag, comprising two opposing, longitudinally-extending and interlockable rib and groove profiles, wherein a part of one or both of the profiles is divided into segments of materials having different elastic moduli interlockable with a portion of the opposing profile, said interlockable profiles being substantially free of interdigitation with one another, the zipper producing an auditably or tactically perceptible difference in the force required to close adjacent portions of the zipper.
Claim 2
Dependent Claim
77 words
A zipper closure for a reclosable thermoplastic bag, comprising two opposing, longitudinally-extending and interlockable rib and groove profiles, wherein a part of one or both of the profiles is divided into segments of materials having different elastic moduli interlockable with a portion of the opposing profile, said interlockable profiles being substantially free of interdigitation with one another, the zipper producing an auditably or tactically perceptible difference in the force required to close adjacent portions of the zipper.
Claim 3
Dependent Claim
35 words
A zipper as defined in claim 1, wherein the segments are arranged so as to produce both an audibly and a tactilely perceptible difference in the force required to close adjacent portions of the zipper.
Claim 4
Dependent Claim
25 words
A zipper as defined in claim 1, wherein a part of the rib profile is segmented and the groove profile is of a single material.
Claim 5
Dependent Claim
22 words
A zipper as defined in claim 1, wherein the rib profile is of a single material and the groove profile is segmented.
Claim 6
Dependent Claim
20 words
A zipper as defined in claim 1, wherein opposing interlockable parts of both the rib and groove profile are segmented.
Claim 7
Dependent Claim
27 words
A zipper as defined in claim 1, wherein the rib and groove profiles each are of a longitudinally consistent cross-section in terms both of size and configuration.
Claim 8
Dependent Claim
18 words
A reclosable thermoplastic bag having the zipper of any of claim 1 or 4-6 about an opening thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-18 | 1996-02-17 | 1996-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-18 | 2000-02-17 | 2000-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-18 | 2004-02-17 | 2004-08-18 | $7700.00 | Window Closed / Lapsed |