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US4135654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rucksack frame
Assignee: YIP HING CAMPING GOODS MANUFACTURY Ltd
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Filing: 1977-04-11
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Granted: 1979-01-23
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Expires: 1997-04-11
Abstract
Abstract The rucksack frame comprises longitudinal and transverse plastics members of generally C-shaped cross-section, open towards the rear of the frame. Each member has an integral rib, preferably of round cross-section, which extends along the interior of the member and strengthens it against bending or breaking.
Inventors
- 👤 Cheuk S. Chu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:59
CPC Classifications
A; A45; A45F; A45F3/00; A45F3/04; A45F3/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
55 words
A rucksack frame comprising longitudinal and transverse plastics members which are substantially tubular but are open towards the rear of the frame so that they are of generally C-shaped cross-section, each said member having an integral rib extending along its interior and with each member having integral cross-pieces extending across its interior at spaced intervals.
Claim 2
Dependent Claim
55 words
A rucksack frame comprising longitudinal and transverse plastics members which are substantially tubular but are open towards the rear of the frame so that they are of generally C-shaped cross-section, each said member having an integral rib extending along its interior and with each member having integral cross-pieces extending across its interior at spaced intervals.
Claim 3
Dependent Claim
14 words
The rucksack frame of claim 1, in which the ribs are of round cross-section.
Claim 4
Dependent Claim
14 words
The rucksack frame of claim 1, further comprising plastics struts interconnecting the said members.
Claim 5
Dependent Claim
14 words
The rucksack frame of claim 3, in which the struts are of I-shaped cross-section.
Claim 6
Dependent Claim
75 words
A rucksack frame comprising longitudinal and transverse plastics members which are substantially tubular but are open towards the rear of the frame so that they are of generally C-shaped cross-section, each said member having an integral rib extending along its interior, with at least some of said members having the interior of said C-shaped configuration filled in over only a discreet portion of the length thereof with integral blocks, said blocks having holes formed therethrough.
Claim 7
Dependent Claim
75 words
A rucksack frame comprising longitudinal and transverse plastics members which are substantially tubular but are open towards the rear of the frame so that they are of generally C-shaped cross-section, each said member having an integral rib extending along its interior, with at least some of said members having the interior of said C-shaped configuration filled in over only a discreet portion of the length thereof with integral blocks, said blocks having holes formed therethrough.
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) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |