US3808649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanently closable fastener
Assignee: Individual
•
Filing: 1971-07-26
•
Granted: 1974-05-07
•
Expires: 1991-07-26
Abstract
Abstract A flexible fastener for joining plastic sheets such as in closing the tops of bags wherein the fastener strips remain permanently closed once they are joined. The strips include a first strip formed of a plastic material having a web portion with a rib element extending continuously therealong having a neck portion and an enlarged head with a second fastener strip formed of a plastic material with a web portion having a groove element extending therealong formed of a pair of spaced jaws with a head retaining groove therein shaped to correspond to the shape of the head and with an entrance slot leading to the groove with the head and jaws being such that they will not interlock when pressed together but can be interlocked only by an external joining tool which forcibly spreads the jaws apart, places the rib element in position and allows the jaws to close around said rib so that once interlocked, they cannot be separated by pulling apart on the webs.
Inventors
- 👤 S Ausnit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:32
CPC Classifications
B; B65; B65D; B65D33/00; B65D33/16; B65D33/25; B65D33/2508; B65D33/2541; A; A44; A44B; A44B19/00; A44B19/10; A44B19/16; Y; Y10; Y10T; Y10T24/00; Y10T24/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
214 words
A flexible fastener comprising in combination, a first fastener strip formed of a plastic material and having a web portion with a rib element extending continuous therealong, said rib element having a neck portion attached to tHe web and with an enlarged head thereon with a tip at the distal end of the head and side barbs projecting from the sides of the head, a second fastener strip formed of a plastic material with a web portion having a groove element extending continuously therealong having a pair of jaws spaced to form a head retaining groove therebetween and with an entrance slot leading to the base of the groove and the groove shaped to correspond approximately to the shape of the head. the dimensions of the elements being such when the head is pressed into the groove and the barbs lie along the head that the length of the head from the tip to the ends of the barbs is longer than the distance from said base of the groove to the ends of said jaws whereby said jaws will not pass around the head to lock around the barbs when he head is merely pressed into the slot and whereby the strips must be interlocked by forcibly wrapping the jaws over the barbs.
Claim 2
Dependent Claim
214 words
A flexible fastener comprising in combination, a first fastener strip formed of a plastic material and having a web portion with a rib element extending continuous therealong, said rib element having a neck portion attached to tHe web and with an enlarged head thereon with a tip at the distal end of the head and side barbs projecting from the sides of the head, a second fastener strip formed of a plastic material with a web portion having a groove element extending continuously therealong having a pair of jaws spaced to form a head retaining groove therebetween and with an entrance slot leading to the base of the groove and the groove shaped to correspond approximately to the shape of the head. the dimensions of the elements being such when the head is pressed into the groove and the barbs lie along the head that the length of the head from the tip to the ends of the barbs is longer than the distance from said base of the groove to the ends of said jaws whereby said jaws will not pass around the head to lock around the barbs when he head is merely pressed into the slot and whereby the strips must be interlocked by forcibly wrapping the jaws over the barbs.
Claim 3
Dependent Claim
39 words
A flexible fastener constructed in accordance with claim 1 and including a first film of plastic attached to the web of the first fastener and a second film of plastic attached to the web of the second fastener strip.
Claim 4
Dependent Claim
29 words
A flexible fastener constructed in accordance with claim 1 and including first and second films of plastic respectively integral with the web portions of said first and second strips.
Claim 5
Dependent Claim
25 words
A flexible fastener constructed in accordancd with claim 1 wherein the width of the head is at least twice the width of said entrance slot.
Claim 6
Dependent Claim
162 words
A flexible fastener comprising in combination, a first fastener strip formed of a plastic material having a web portion with a rib element extending continuously therealong, said rib element having a neck portion attached to the web with an enlarged head thereon having a tip and barbs extending laterally from the head, and a second fastener strip formed of a plastic material with a web portion having a groove element extending continually therealong formed of a pair of jaws spaced to form a groove therebetween shaped to correspond approximately to the shape of the head with an entrance slot leading to the base of the groove and the jaws wrapped around the barbs in interlocked relationship, said jaws being separable from each other a limited distance as said strips are forcibly pulled apart to provide a maximum width entrance slot between the jaws, said maximum slot width being less than the width of the head measured to the ends of the barbs.
Claim 7
Dependent Claim
162 words
A flexible fastener comprising in combination, a first fastener strip formed of a plastic material having a web portion with a rib element extending continuously therealong, said rib element having a neck portion attached to the web with an enlarged head thereon having a tip and barbs extending laterally from the head, and a second fastener strip formed of a plastic material with a web portion having a groove element extending continually therealong formed of a pair of jaws spaced to form a groove therebetween shaped to correspond approximately to the shape of the head with an entrance slot leading to the base of the groove and the jaws wrapped around the barbs in interlocked relationship, said jaws being separable from each other a limited distance as said strips are forcibly pulled apart to provide a maximum width entrance slot between the jaws, said maximum slot width being less than the width of the head measured to the ends of the barbs.
Claim 8
Dependent Claim
66 words
A structure including a flexible fastener in accordance with claim 5 and including a bag having a plastic front wall and a plastic rear wall with said walls joined to each other on three sides wih the fourth side joined by the strips with the web of one strip attached to the front wall and the web of the other strip attached to the rear wall.
Claim 9
Dependent Claim
28 words
A flexible fastener in accordance with claim 5 wherein said webs have plastic films extending downwardly with an absence of web or film extending upwardly from the strips.
Claim 10
Dependent Claim
23 words
A flexible fastener in accordance with claim 5 wherein the jaws are further retained in locking position by additional arms on either side.
Claim 11
Dependent Claim
22 words
A structure in accordance with claim 6 wherein the fastener strips are bonded by a bond of plastic to the bag walls.
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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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |