US3825172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular flexible bag with lap welded ends
Assignee: Individual
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Filing: 1973-04-23
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Granted: 1974-07-23
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Expires: 1993-04-23
Abstract
Abstract A length of plastic material is rolled to form a tube, the ends being lapped and partially welded to leave an access opening to the inside of the bag. The bag is then telescoped over welding die or form having the general configuration of the tube, but axially compressed. The tube is then accordion folded about the thin form so that the ends of the tube can be wrapped around peripheral rims of the form. End pieces are then welded in place, the form is removed through the access opening and the partially welded lap joint forming the access opening is sealed.
Inventors
- 👤 C Mollura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:02
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/04; A; A47; A47C; A47C27/00; A47C27/08; A47C27/085; B29C66/00; B29C66/004; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/4326; B29C66/49; B29C66/50; B29C66/51; B29C66/53; B29C66/534; B29C66/5346; B29C66/53461; B29C66/53462; B29C66/61; B29C66/63; B29C66/80; B29C66/81; B29C66/812; B29C66/8126; B29C66/81262; B29C66/81263; B29C66/83; B29C66/832; B29C66/8322; B29C66/84; B29C66/843; B29C66/70; B29C66/71; B29L; B29L2022/00; B29L2022/02; B29L2031/00; B29L2031/751; Y; Y10; Y10S; Y10S5/00; Y10S5/932
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
152 words
A lap welded plastic bag in the form of a tube of substantially uniform cross-sectional configuration, said bag comprising three plastic sections, a. one section comprising a sheet of material having ends lapped and welded together to form said tube; b. the marginal ends of said tube being inwardly folded to form at each end of said tube a marginal flange that is unbroken and of single thickness; c. The second and third sections being end pieces each having the shape and dimension of said cross-sectional configuration; d. the marginal edge of each end piece respectively overlying and being lap welded to the corresponding inwardly folded, single thickness marginal flange at the end of said tube; e. said plastic bag being fluid impervious and flexible; f. the internal fluid pressure of fluid contained by said bag being resisted by stressing across the entire transverse width of each lap weld joining said sections.
Claim 2
Dependent Claim
152 words
A lap welded plastic bag in the form of a tube of substantially uniform cross-sectional configuration, said bag comprising three plastic sections, a. one section comprising a sheet of material having ends lapped and welded together to form said tube; b. the marginal ends of said tube being inwardly folded to form at each end of said tube a marginal flange that is unbroken and of single thickness; c. The second and third sections being end pieces each having the shape and dimension of said cross-sectional configuration; d. the marginal edge of each end piece respectively overlying and being lap welded to the corresponding inwardly folded, single thickness marginal flange at the end of said tube; e. said plastic bag being fluid impervious and flexible; f. the internal fluid pressure of fluid contained by said bag being resisted by stressing across the entire transverse width of each lap weld joining said sections.
Claim 3
Dependent Claim
35 words
A water mattress consisting of a plastic bag according to claim 1, wherein said end pieces are generally rectangular so that the bag takes on the configuration of a rectangular parallelopiped when filled with water.
Claim 4
Dependent Claim
33 words
A water mattress according to claim 2 further comprising a connector assembly attached to said bag and covering a fill hole therein, said connector assembly facilitating the filling of said mattress with water.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |