US4357724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic core for adjustable firmness of mattresses, cushions and the like
Assignee: International Business Machines Corp
•
Filing: 1980-07-24
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Granted: 1982-11-09
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Expires: 2000-07-24
Abstract
Abstract A pneumatic core for mattresses, cushions, car seats and the like, is disclosed. The core comprises an upper sheet of rubberized cloth and a lower sheet of flexible rubber material forming a plurality of protrusions when inflated.
Inventors
- 👤 Guy Laforest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:28
CPC Classifications
A; A47; A47C; A47C27/00; A47C27/14; A47C27/18; A47C23/00; A47C23/04; A47C23/047; A47C23/30; A47C27/04; A47C27/06; A47C27/061; A47C27/08; A47C27/081; Y; Y10; Y10S; Y10S297/00; Y10S297/03
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
61 words
In a combination with a mattress, cushion, car seats and the like articles, having an inner coil spring structure, a pneumatic core overlying said structure and comprising an upper sheet of rubberized, non-elastic cloth and a lower sheet of flexible, elastic rubber forming a plurality of protrusions inserted in the openings of the coil springs of said inner coil spring structure.
Claim 2
Dependent Claim
61 words
In a combination with a mattress, cushion, car seats and the like articles, having an inner coil spring structure, a pneumatic core overlying said structure and comprising an upper sheet of rubberized, non-elastic cloth and a lower sheet of flexible, elastic rubber forming a plurality of protrusions inserted in the openings of the coil springs of said inner coil spring structure.
Claim 3
Dependent Claim
35 words
The combination as defined in claim 1, further including a padding overlying and glued to the upper sheet of rubberized cloth and a cover placed over the overall padding, core and inner coil spring structure.
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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) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |