US3570749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heavy duty bags
Assignee: Resonac Holdings Corp
•
Filing: 1969-08-05
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Granted: 1971-03-16
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Expires: 1989-08-05
Abstract
Abstract Heavy duty bags wherein stretched tapes made of synthetic resin such as high density polyethylene or polypropylene are spirally wound in opposite directions in a manner to intersect each other to form a plurality of superposed cylindrical bodies. The superposed portions of the intersecting stretched tapes forming said cylindrical bodies are bonded together to form a cylindrical network, one end of which is sealed to provide a bottom.
Inventors
- 👤 Wasuke Sato
- 👤 Fumio Iriko
- 👤 Sadao Yamamoto
- 👤 Mitsumaro Fujisawa
- 👤 Shigeyuki Hatakeyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:05
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/36; B29C53/38; B29C53/48; B29C53/50; B29C53/56; B29C53/58; B29C53/581; B29C53/60; B29C53/607; B31; B31C; B31C3/00; B65; B65D; B65D29/00; B65D29/02; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0608; B29K2023/065; B29K2023/10; B29K2023/12; B29K2223/00; B29K2223/10; B29K2223/12; B29L; B29L2031/00; B29L2031/712; B29L2031/7128; B31B; B31B2155/00; B31B2170/00; B31B2170/20; Y; Y10; Y10S; Y10S383/00; Y10S383/908
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
42 words
The heavy duty bag according to claim 1 comprising a synthetic resin film bonded to at least one of the areas represented by an interspace between the inner and outer cylindrical bodies, and the inner and outer surfaces of the cylindrical network.
Claim 2
Dependent Claim
23 words
The heavy duty bag according to claim 1 comprising a yarn bonded to at least one side of the synthetic resin stretched tape.
Claim 3
Dependent Claim
23 words
The heavy duty bag according to claim 2 comprising a yarn bonded to at least one side of the synthetic resin stretched tape.
Claim 4
Dependent Claim
50 words
The heavy duty bag according to claim 1 wherein the bag includes a first spirally wound synthetic resin stretched tape, and a different kind of tape, similarly spirally wound, the different kind of tape being incorporated in the interspaces between the first mentioned windings, thereby forming a heavy duty bag.
Claim 5
Dependent Claim
50 words
The heavy duty bag according to claim 2 wherein the bag includes a first spirally wound synthetic resin stretched tape, and a different kind of tape, similarly spirally wound, the different kind of tape being incorporated in the interspaces between the first mentioned windings, thereby forming a heavy duty bag.
Claim 6
Dependent Claim
23 words
The heavy duty bag according to claim 1 wherein at least one of the cylindrical bodies is comprised of a foamed stretched tape.
Claim 7
Dependent Claim
23 words
The heavy duty bag according to claim 2 wherein at least one of the cylindrical bodies is comprised of a foamed stretched tape.
Claim 8
Dependent Claim
62 words
The heavy duty bag according to claim 1 wherein a cylindrical body is comprised of a double-layer stretched tape, one side of which includes a high crystallinity thermoplastic resin and the other side of which includes another thermoplastic resin having a softening point 20* C. or more lower than the former resin, the layers of said low softening resin facing each other.
Claim 9
Dependent Claim
62 words
The heavy duty bag according to claim 2 wherein a cylindrical body is comprised of a double-layer stretched tape, one side of which includes a high crystallinity thermoplastic resin and the other side of which includes another thermoplastic resin having a softening point 20* C. or more lower than the former resin, the layers of said low softening resin facing each other.
Claim 10
Dependent Claim
30 words
The heavy duty bag according to claim 1 wherein the synthetic resin stretched tape is comprised of one material selected from the group consisting of high density polyethylene and polypropylene.
Claim 11
Dependent Claim
29 words
The heavy duty bag according to claim 2 wherein the synthetic resin film is comprised of one material selected froM the group consisting of polyethylene, polypropylene, and polyvinyl chloride.
Claim 12
Dependent Claim
34 words
The heavy duty bag according to claim 3 wherein the yarn is comprised of one material selected from the group consisting of cotton, hemp, and synthetic fibers of polyamide, polyvinyl alcohol and polypropylene systems.
Claim 13
Dependent Claim
41 words
The heavy duty bag according to claim 5 wherein the different kind of tape jointly used with the synthetic resin stretched tape is a hydrophilic type comprised of one material selected from the group consisting of paper, cellophane and polyvinyl alcohol.
Claim 14
Dependent Claim
28 words
The heavy duty bag according to claim 5 wherein the different kind of tape jointly used with the synthetic resin stretched tape is made of low density polyethylene.
Claim 15
Dependent Claim
43 words
The heavy duty bag according to claim 5 wherein the different kind of tape jointly used with the synthetic resin stretched tape is a foamed type and is comprised of one material selected from the group consisting of high density polyethylene and polypropylene.
Claim 16
Dependent Claim
27 words
The heavy duty bag according to claim 7 wherein the foamed stretched tape is made of one material selected from the group consisting of polyethylene and polypropylene.
Claim 17
Dependent Claim
31 words
The heavy duty bag according to claim 9 wherein the high crystallinity thermoplastic resin if formed of one material selected from the group consisting of high density polyethylene, polypropylene and polyamide.
Claim 18
Dependent Claim
36 words
The heavy duty bag according to claim 9 wherein the low softening point thermoplastic synthetic resin is made of one material selected from the group consisting of low density polyethylene, ethylene-vinyl acetate copolymer and ethylene-propylene copolymer.
References Cited (Backward Citations)
US2493085A
Cited
US2934122A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |