US4391404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sleeve valve for flexible bags
Assignee: Stone Container Corp
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Filing: 1981-08-13
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Granted: 1983-07-05
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Expires: 2001-08-13
Abstract
Abstract An improved sleeve valve for use in a flexible paper bag which is adapted to package granular products. The sleeve is mounted in the open mouth located in a corner of the flexible bag and adapted to receive the filler spout of a product-dispensing mechanism. The sleeve valve comprises a tubular plastic sleeve which is adhered to both the open mouth of the bag and to a paper backing panel. The sleeve valve is adhered to the backing panel by three glue bars which are spaced from each other and spaced inwardly from the mouth of the sleeve valve. The rear portion of the paper backing panel is slit lengthwise along its longitudinal center and the rear portion of the plastic sleeve valve adjacent the backing panel is also slit lengthwise along its longitudinal center in substantial juxtaposition with the slit in the paper backing panel.
Inventors
- 👤 Albert Welter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:40
CPC Classifications
B; B65; B65D; B65D31/00; B65D31/14; B65D31/142
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
180 words
A flexible bag comprising side walls, a top wall and a bottom wall, an open mouth in the corner of said top wall comprising an end flap, a sleeve valve mounted in said open mouth, said sleeve valve comprising a tubular sleeve and a backing panel, the upper front portion of the tubular sleeve being adhered to the backing panel by an adhesive area and the lower front portion of the sleeve adhered to the end flap of said open mouth of the bag, the upper and lower rear portions of said sleeve being unattached to the backing panel and to said end flap and being adapted to hang within the bag, and a longitudinal slit located exclusively in the upper rear portion of said sleeve, said slit terminating short of said adhesive area to form an unslit area of said upper rear portion unadhered to said backing panel whereby the said unslit area together with the lower rear portion of said sleeve folds over the open mouth to seal the open mouth in the two-ply region of the sleeve.
Claim 2
Dependent Claim
180 words
A flexible bag comprising side walls, a top wall and a bottom wall, an open mouth in the corner of said top wall comprising an end flap, a sleeve valve mounted in said open mouth, said sleeve valve comprising a tubular sleeve and a backing panel, the upper front portion of the tubular sleeve being adhered to the backing panel by an adhesive area and the lower front portion of the sleeve adhered to the end flap of said open mouth of the bag, the upper and lower rear portions of said sleeve being unattached to the backing panel and to said end flap and being adapted to hang within the bag, and a longitudinal slit located exclusively in the upper rear portion of said sleeve, said slit terminating short of said adhesive area to form an unslit area of said upper rear portion unadhered to said backing panel whereby the said unslit area together with the lower rear portion of said sleeve folds over the open mouth to seal the open mouth in the two-ply region of the sleeve.
Claim 3
Dependent Claim
27 words
A flexible bag as claimed in claim 1 wherein the rear portion of said backing panel is slit longitudinally in juxtaposition to the slit in said sleeve.
Claim 4
Dependent Claim
42 words
A flexible bag as claimed in claim 2 wherein said open mouth is formed by closure flaps which are interposed over each other and by a pair of end flaps underlying the superimposed closure flaps, and said sleeve valve being interposed therebetween.
Claim 5
Dependent Claim
35 words
A flexible bag as claimed in claim 3 wherein the backing panel is adhered to the superimposed closure flaps and wherein the lower rear portion of the tubular sleeve is adhered to the end flaps.
Claim 6
Dependent Claim
17 words
A flexible bag as claimed in claim 4 wherein said slit is about four inches in length.
Claim 7
Dependent Claim
25 words
A flexible bag as claimed in claim 5 wherein said tubular sleeve is adhered to said backing panel by a plurality of spaced glue bars.
Claim 8
Dependent Claim
31 words
A flexible bag as claimed in claim 6 wherein said glue bars extend inwardly from the said open mouth of the bag for a distance of between one and two inches.
Claim 9
Dependent Claim
29 words
A flexible bag as claimed in claim 7 wherein the said glue bars are about one-half inch in width and are spaced from each other by about one-half inch.
Claim 10
Dependent Claim
14 words
A flexible bag as claimed in claim 8 wherein three glue bars are provided.
Claim 11
Dependent Claim
28 words
A flexible bag as claimed in claim 9 wherein said backing panel is a paper backing panel and wherein said tubular sleeve is of a flexible plastic material.
Claim 12
Dependent Claim
18 words
A flexible bag as claimed in claim 10 wherein the said flexible bag is of a paper material.
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) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |