US4576844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shipping bag
Assignee: NATIONAL TRUST Co A TRUST Co OF ONTARIO
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Filing: 1984-07-16
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Granted: 1986-03-18
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Expires: 2004-07-16
Abstract
Abstract A thermoplastic heavy duty shipping bag having walls formed of cross-laminated outer plies of uni-axially oriented polyethylene and inner walls of low density polyethylene, heat sealed thereto. The bag provides improved puncture and snag resistance.
Inventors
- 👤 Charles R. Murray
- 👤 Ray E. Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:32
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C66/00; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C65/00; B29C65/02; B29C65/82; B29C65/8207; B29C65/8238; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/13; B29C66/133; B29C66/20; B29C66/23; B29C66/232; B29C66/70; B29C66/71; B29C66/72; B29C66/723; B29C66/73; B29C66/737; B29C66/7371; B29C66/73711; B29C66/73712; B29C66/739; B29C66/7392; B29C66/73921; B32B27/32; B32B27/322; B65; B65D; B65D31/00; B65D31/02; B29L; B29L2031/00; B29L2031/712; B29L2031/7128; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/514; B32B2307/516; B32B2323/00; B32B2323/04; B32B2323/046; B32B2439/00; Y; Y10; Y10S; Y10S383/00; Y10S383/908; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
111 words
A thermoplastic shipping bag having a front wall and a back wall, each wall comprising a cross-laminated ply comprising at least two sheets of uni-axially oriented polyethylene bonded together; said laminated plies heat sealed one to the other to provide a heat seal area and wherein interposed between said laminated plies in said heat seal area are two layers of low density polyethylene constituting distinct inner plies of the bag, said low density polyethylene plies being heat sealed together and serving as a bridge to permit the effective heat sealing of the laminated plies to each other without significant loss of draw-induced film strength in and around the heat sealed area.
Claim 2
Dependent Claim
111 words
A thermoplastic shipping bag having a front wall and a back wall, each wall comprising a cross-laminated ply comprising at least two sheets of uni-axially oriented polyethylene bonded together; said laminated plies heat sealed one to the other to provide a heat seal area and wherein interposed between said laminated plies in said heat seal area are two layers of low density polyethylene constituting distinct inner plies of the bag, said low density polyethylene plies being heat sealed together and serving as a bridge to permit the effective heat sealing of the laminated plies to each other without significant loss of draw-induced film strength in and around the heat sealed area.
Claim 3
Dependent Claim
24 words
A bag as claimed in claim 1 wherein said cross-laminated ply comprises at least two sheets of uni-axially oriented high density polyethylene bonded together.
Claim 4
Dependent Claim
24 words
A bag as claimed in claim 1 wherein said cross-laminated ply comprises at least two sheets of uni-axially oriented low density polyethylene bonded together.
Claim 5
Dependent Claim
25 words
A bag as claimed in claim 1 wherein said cross-laminated ply comprises at least two sheets of uni-axially oriented linear low density polyethylene bonded together.
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) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |