Patent US3576706A successfully refreshed from Google Patents.
US3576706A
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US
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Carpet underlay
Assignee: Bayer Corp
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Filing: 1968-07-25
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Granted: 1971-04-27
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Expires: 1988-07-25
Abstract
Abstract CARPET UNDERLAY WHEREIN A SELF-SUSTAINING FACING LAYER AND A POLYURETHANE FOAM LAYER ARE ADHESIVELY BOUND TOGETHER. THE POLYURETHANE FOAM HAS CENTAIN CRITICAL PROPERTIES INCLUDING: A DENSITY OF ABOUT 3 TO ABOUT 8 POUNDS PER CUBIC FOOT, AN INDENTATION LOAD DEFLECTION OF AT LEAST ABOUT 50 POUNDS AT 25% DEFLECTION PER 50 SQUARE INCH AREA FOR AT LEAST AN 0.5 INCH THICKNESS, A COMPRESSION SET BELOW ABOUT 10% AFTER 22 HOURS AT 90% COMPRESSION, A TENSILE STRENGTH OF AT LEAST ABOUT 10 POUNDS PER SQUARE INCH, AN ELONGATION OF AT LEAST ABOUT 50%, AND A FOAM SOFTENING BY LINEAR SHEAR OF LESS THAN 50%.
Inventors
- 👤 Gert F Baumann
- 👤 John F Szabat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:54
CPC Classifications
B; B32; B32B; B32B27/00; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249982; Y10T428/249985; Y10T428/249986; Y10T428/26; Y10T428/266; Y10T428/31504; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |