US3855653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a mattress and said mattress
Assignee: Motor Wheel Corp
•
Filing: 1973-09-17
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Granted: 1974-12-24
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Expires: 1993-09-17
Abstract
Abstract A polyurethane foam encapsulated spring mattress assembly having a set of springs enclosed in a fabric envelope positioned within the mattress and covered with an open cell polyurethane foam, said envelope being covered with polyurethane foam while the springs are compressed.
Inventors
- 👤 R Stalter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:04
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C44/1266; A; A47; A47C; A47C27/00; A47C27/14; A47C27/20; Y; Y10; Y10S; Y10S297/00; Y10S297/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
60 words
A polyurethane foam encapsulated spring mattress assembly, including a set of springs encLosed in a fabric envelope positioned within the mattress and covered with an open celled polyurethane foam, said envelope fitting the set of springs tightly when the mattress is unloaded, said foam being under compression when the springs are unloaded as well as when the springs are loaded.
Claim 2
Dependent Claim
60 words
A polyurethane foam encapsulated spring mattress assembly, including a set of springs encLosed in a fabric envelope positioned within the mattress and covered with an open celled polyurethane foam, said envelope fitting the set of springs tightly when the mattress is unloaded, said foam being under compression when the springs are unloaded as well as when the springs are loaded.
Claim 3
Dependent Claim
21 words
The assembly of claim 1 wherein the springs have expanded at least 0.5 percent in thickness after being covered with 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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |