Patent US3716874A successfully refreshed from Google Patents.
US3716874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differentially resilient spring assembly
Assignee: HOLLAND WIRE PRODUCTS Inc
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Filing: 1971-07-22
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Granted: 1973-02-20
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Expires: 1991-07-22
Abstract
Abstract An assembly of coiled compression springs arranged side-by-side, with the opposite ends of the springs disposed in parallel planes. The ends of the springs at one of these planes are knotted, and the opposite ends are free (cantilever), except for essentially pivotal connections to adjacent spring elements. A mattress having such a spring assembly is covered by upholstery material, and is reversible to give two degrees of local softness.
Inventors
- 👤 H Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:07
CPC Classifications
A; A47; A47C; A47C27/00; A47C27/04; A47C27/06; A47C27/07; A47C23/00; A47C23/04; A47C23/05
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
55 words
A spring assembly including a group of coiled compression spring elements arranged side-by-side with the opposite ends thereof terminating in parallel planes, respectively, said group being reversible with respect to the relative vertical orientation of said planes, wherein the improvement comprises: spring elements constituting said group each having one thereof knotted and one end free.
Claim 2
Dependent Claim
55 words
A spring assembly including a group of coiled compression spring elements arranged side-by-side with the opposite ends thereof terminating in parallel planes, respectively, said group being reversible with respect to the relative vertical orientation of said planes, wherein the improvement comprises: spring elements constituting said group each having one thereof knotted and one end free.
Claim 3
Dependent Claim
55 words
A spring assembly including a group of coiled compression spring elements arranged side-by-side with the opposite ends thereof terminating in parallel planes, respectively, said group being reversible with respect to the relative vertical orientation of said planes, wherein the improvement comprises: spring elements constituting said group each having one thereof knotted and one end free.
Claim 4
Dependent Claim
55 words
A spring assembly including a group of coiled compression spring elements arranged side-by-side with the opposite ends thereof terminating in parallel planes, respectively, said group being reversible with respect to the relative vertical orientation of said planes, wherein the improvement comprises: spring elements constituting said group each having one thereof knotted and one end free.
Claim 5
Dependent Claim
25 words
A spring assembly as defined in claim 1, wherein each of said spring elements is of opposite hand with respect to an adjacent spring element.
Claim 6
Dependent Claim
26 words
A spring assembly as defined in claim 1, additionally including upholstery material disposed opposite both ends of said spring elements and providing substantially continuous supporting surfaces.
Claim 7
Dependent Claim
37 words
A spring assembly as defined in claim 1, wherein said assembly includes at least two groups of spring elements the elements of one group being inverted with respect to the spring elements of another of said groups.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |