Patent US3733005A successfully refreshed from Google Patents.
US3733005A
Expired / Lapsed
US
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Dunnage door for cargo box
Assignee: GENTEX CORP
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Filing: 1971-06-01
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Granted: 1973-05-15
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Expires: 1991-06-01
Abstract
Abstract A dunnage door for use with a cargo box adapted to be partially filled with cargo from the back or the bottom toward the front or the top on which the door is assembled in which the interior of the door is provided with normally collapsed expansible means adapted to be expanded to fill the space between the door and the cargo to prevent movement of the cargo within the box during shipment.
Inventors
- 👤 L Frieder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:15
CPC Classifications
B; B65; B65D; B65D90/00; B65D90/004; B65D90/0046
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
162 words
A dunnage door adapted to be assembled over the open end of a container partially filled with cargo including in combination, a door body having an inside surface, a bellows-like structure comprising an inner end piece attached to said inside surface, a plurality of intermediate pieces forming the side wall of said structure and an outer end piece, said pieces being assembled to enclose an air impermeable space, a plurality of elastic straps disposed outside said space and around the periphery of said structure, means for attaching one end of each of said straps to said inner end piece, means connecting the other end of each of said straps to said outer end piece, means coupling said intermediate pieces adjacent to the peripheries thereof to said straps intermediate the length thereof, said straps normally urging said structure to collapsed condition against said inner surface, and means accessible from outside said door for supplying gas under pressure to the inside of said structure.
Claim 2
Dependent Claim
162 words
A dunnage door adapted to be assembled over the open end of a container partially filled with cargo including in combination, a door body having an inside surface, a bellows-like structure comprising an inner end piece attached to said inside surface, a plurality of intermediate pieces forming the side wall of said structure and an outer end piece, said pieces being assembled to enclose an air impermeable space, a plurality of elastic straps disposed outside said space and around the periphery of said structure, means for attaching one end of each of said straps to said inner end piece, means connecting the other end of each of said straps to said outer end piece, means coupling said intermediate pieces adjacent to the peripheries thereof to said straps intermediate the length thereof, said straps normally urging said structure to collapsed condition against said inner surface, and means accessible from outside said door for supplying gas under pressure to the inside of said structure.
Claim 3
Dependent Claim
24 words
A dunnage door as in claim 1 in which said means connecting said straps to said intermediate pieces comprise rings for receiving said straps.
Claim 4
Dependent Claim
40 words
A dunnage door as in claim 2 including a relief valve mounted in said door to provide communication between the inside of said structure and the outside of said box in response a predetermined buildup of pressure in said interior.
References Cited (Backward Citations)
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US2834606A
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FR1173782A
Cited
US3192879A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |