US3628720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastics sacks provided with venting or aerating perforations
Assignee: Windmoeller and Hoelscher KG
•
Filing: 1969-11-12
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Granted: 1971-12-21
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Expires: 1989-11-12
Abstract
Abstract A bag having walls comprising at least two plies of plastic sheet material, each ply having perforations which are offset from the perforations in the other ply, said perforations each having the form of a tapered nozzle with its tapered end directed in the desired direction of air passages therethrough, at least one of said plies resting on the tapered ends of the nozzles in the other ply, so as to provide a space between said two plies permitting the passage of air between the plies.
Inventors
- 👤 Herbert Schmedding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:28
CPC Classifications
B; B65; B65D; B65D33/00; B65D33/01; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24331
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
90 words
A bag having walls comprising at least two plies of plastic sheet material, each ply including a plurality of tapered nozzles defining perforations to form air passages therethrough, the tapered end of each nozzle being directed in the desired direction of air passage, said ply perforations being offset from the perforations in the other ply and at least one of said plies resting on the tapered ends of said tapered nozzles in the other ply to provide space between said two plies permitting the passage of air between said plies.
Claim 2
Dependent Claim
90 words
A bag having walls comprising at least two plies of plastic sheet material, each ply including a plurality of tapered nozzles defining perforations to form air passages therethrough, the tapered end of each nozzle being directed in the desired direction of air passage, said ply perforations being offset from the perforations in the other ply and at least one of said plies resting on the tapered ends of said tapered nozzles in the other ply to provide space between said two plies permitting the passage of air between said plies.
Claim 3
Dependent Claim
20 words
A bag according to claim 1, wherein the perforations have been formed by piercing the individual plies with pointed needles.
Claim 4
Dependent Claim
26 words
A bag according to claim 2, wherein the direction of piercing the perforations in both or all plies is form outside the bag towards the interior.
Claim 5
Dependent Claim
28 words
A bag according to claim 2, wherein the direction of piercing the perforations in both or all plies is from the interior of the bag towards the outside.
Claim 6
Dependent Claim
20 words
A bag according to claim 2, wherein the direction of piercing the perforations is towards one another in adjacent plies.
Claim 7
Dependent Claim
37 words
A two-ply bag according to claim 2, wherein the outer ply has its perforations pierced in a direction from the interior of the bag towards the outside and the inner ply has perforations pierced in both directions.
Claim 8
Dependent Claim
59 words
A two-ply bag according to claim 2, wherein the outer ply has its perforations pierced in a direction from the interior of the bag towards the outside and the inner ply has its perforations pierced in a direction from the outside of the bag towards the inside, the inner ply being also provided with outwardly directed protuberances or pimples.
Claim 9
Dependent Claim
23 words
A bag according to claim 1, wherein the perforations of the individual plies are distributed over the entire wall area of the bag.
Claim 10
Dependent Claim
26 words
A bag according to claim 1, wherein the perforations of the individual plies are disposed over one or more longitudinal strip portions of the bag walls.
Claim 11
Dependent Claim
20 words
A bag according to claim 9, wherein the perforated longitudinal strip portions are located adjacent side folds of the bag.
Claim 12
Dependent Claim
26 words
A bag according to claim 1, wherein the perforations of the individual plies are disposed over one or more transverse strip portions of the bag walls.
Claim 13
Dependent Claim
36 words
A bag accorDing to claim 1, wherein the unperforated portions of the plies have been subjected to an activating surface treatment so that, other than along the perforated strip portions, the plies cling to one another.
References Cited (Backward Citations)
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Cited
US2545243A
Cited
US2593328A
Cited
US3085608A
Cited
US3092439A
Cited
US3507443A
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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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |