Patent US3852152A successfully refreshed from Google Patents.
US3852152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resilient cushion
Assignee: Akzona Inc
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Filing: 1972-07-13
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Granted: 1974-12-03
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Expires: 1992-07-13
Abstract
Abstract This invention relates to a resilient filamentary cushioning unit or pad and a process for its production wherein a plurality of substantially amorphous thermoplastic filaments, e.g., fiberforming polyamide filaments, are melt-spun into a liquid cooling bath in such a manner that they lie in the form of predominately helical to sinuous loops randomly bonded at their points of intersection as the filaments are completely solidified in the bath. The resulting looped and bonded filaments form a cohesive resilient structure which is useful as a spring core or cushioning unit.
Inventors
- 👤 H Werner
- 👤 H Stapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:51
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/08; D04H3/16; Y; Y10; Y10T; Y10T24/00; Y10T24/27; Y10T428/00; Y10T428/26; Y10T428/268; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2925; Y10T442/00; Y10T442/60; Y10T442/68
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
A RESILIENT CUSHIONING UNIT CONSISTING ESSENTIALLY OF A PLURALITY OF CONTINUOUS MELT-SPUN FILAMENTS OF A SUBSTANTIALLY AMORPHOUS SYNTHETIC THERMOPLASTIC FIBER-FORMING POLYMER WITH A FILAMENT DIAMETER OF BETWEEN ABOUT 0.1 AND 1 MM., EACH OF SAID CONTINUOUS FILAMENTS EXTENDING SIDE BY SIDE IN THE DIRECTION OF COMPRESSION OF THE CUSHIONING UNIT IN THE FORM OF FILAMENTARY SPRINGS HAVING SUBSTANTIALLY PERIODIC HELICAL TO SINUOUS LOOPS WHICH COIL AROUND PARALLEL VERTICAL AXES CORRESPONDING TO SAID DIRECTION OF COMPRESSION, SAID LOOPS OF EACH
Claim 2
Dependent Claim
79 words
A RESILIENT CUSHIONING UNIT CONSISTING ESSENTIALLY OF A PLURALITY OF CONTINUOUS MELT-SPUN FILAMENTS OF A SUBSTANTIALLY AMORPHOUS SYNTHETIC THERMOPLASTIC FIBER-FORMING POLYMER WITH A FILAMENT DIAMETER OF BETWEEN ABOUT 0.1 AND 1 MM., EACH OF SAID CONTINUOUS FILAMENTS EXTENDING SIDE BY SIDE IN THE DIRECTION OF COMPRESSION OF THE CUSHIONING UNIT IN THE FORM OF FILAMENTARY SPRINGS HAVING SUBSTANTIALLY PERIODIC HELICAL TO SINUOUS LOOPS WHICH COIL AROUND PARALLEL VERTICAL AXES CORRESPONDING TO SAID DIRECTION OF COMPRESSION, SAID LOOPS OF EACH
Claim 3
Dependent Claim
23 words
A resilient filamentary cushioning unit as claimed in claim 1 in which the individual filament diameter is from about 0.3 to 0.5 mm.
Claim 4
Dependent Claim
18 words
A resilient filamentary cushioning unit as claimed in claim 1 wherein the polymer is a synthetic fiber-forming polyamide.
Claim 5
Dependent Claim
15 words
A resilient filamentary cushioning unit as claimed in claim 1 wherein the polymer is polycaprolactam.
Claim 6
Dependent Claim
16 words
A resilient filamentary cushioning unit as claimed in claim 1 wherein the polymer is polyhexamethylene adipamide.
Claim 7
Dependent Claim
49 words
A resilient filamentary cushioning unit as claimed in claim 1 wherein the parallel axes of the filamentary springs are spaced about equidistantly from each other corresponding approximately to the linear path of the freshly spun filaments, said axes being separated by a distance of about 3 to 10 mm.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |