US3854157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unitary space frame
Assignee: Hercules LLC
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Filing: 1973-07-25
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Granted: 1974-12-17
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Expires: 1993-07-25
Abstract
Abstract The invention is a unitary space frame that has utility as a box spring frame and can be injection molded in a simple two-piece mold comprising an offset grid space frame having two grids similar in geometry with one grid offset from the other in plan said grids connected by connecting members that are parallel to the direction of mold opening travel and that interconnect angularly askewed members of said grids.
Inventors
- 👤 D Trimble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:24
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/26; A; A47; A47C; A47C23/00; A47C23/002; A47C23/30; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/42
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
A unitary space frame suitable for forming in a simple twopiece mold having a direction of mold opening travel, comprising: an upper and a lower grid composed of grid members, said upper grid being offset from said lower grid in plan; and a plurality of first connecting members each interconnecting a grid member in said upper grid and a grid member in said lower grid that are angularly askew, said first connecting members being oriented parallel to the direction of mold opening travel.
Claim 2
Dependent Claim
83 words
A unitary space frame suitable for forming in a simple twopiece mold having a direction of mold opening travel, comprising: an upper and a lower grid composed of grid members, said upper grid being offset from said lower grid in plan; and a plurality of first connecting members each interconnecting a grid member in said upper grid and a grid member in said lower grid that are angularly askew, said first connecting members being oriented parallel to the direction of mold opening travel.
Claim 3
Dependent Claim
74 words
A unitary box spring frame, comprising: an upper and a lower grid composed of grid members, said upper grid being offset in plan from and substantially parallel to said lower grid; and a plurality of first connecting members perpendicular to said upper grid each of said first connecting members interconnecting a grid member of said upper grid and a grid member of said lower grid that are angularly askew with respect to each other.
Claim 4
Dependent Claim
74 words
A unitary box spring frame, comprising: an upper and a lower grid composed of grid members, said upper grid being offset in plan from and substantially parallel to said lower grid; and a plurality of first connecting members perpendicular to said upper grid each of said first connecting members interconnecting a grid member of said upper grid and a grid member of said lower grid that are angularly askew with respect to each other.
Claim 5
Dependent Claim
24 words
A box spring frame as in claim 2 further including a plurality of second members diagonally interconnecting said upper grid and said lower grid.
Claim 6
Dependent Claim
27 words
A box spring frame as in claim 3 further including a plurality of spring attaching portions connected to said second members to which spring may be fastened.
Claim 7
Dependent Claim
15 words
A box spring frame as in claim 4 wherein said frame is polypropylene structural foam.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |