Patent US3577519A successfully refreshed from Google Patents.
US3577519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for controlling the amount of densification in polyurethane foams and products produced thereby
Assignee: ER Carpenter Co
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Filing: 1968-11-29
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Granted: 1971-05-04
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Expires: 1988-11-29
Abstract
Abstract THE EXTERIOR, LESS DENSE LAYERS IN A SELECTED, FLEXIBLE DENSIFIED POLYURETHANE FOAM PREPARED BY APPLYING A COMPRESSIVE FORCE TO A PARTIALLY CURED CELLULAR MATERIAL AT A CRITICAL TIME TO REDUCE ITS VOLUME BY A SPECIFIED AMOUNT ARE REDUCED BY MAINTAINING THE COMPRESSIVE FORCE FOR BETWEEN ABOUT 0.1 AND ABOUT 10 MINUTES. IF DESIRED, THE COMPRESSIVE MEANS CAN BE HEATED TO A TEMPERATURE BETWEEN ABOUT 40* AND ABOUT 200*C. THE RESULTING FOAMS ARE PARTICULARLY USEFUL FOR SUCH APPLICATIONS AS RUG PADDING.
Inventors
- 👤 Mario A Gambardella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:00
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S521/00; Y10S521/918
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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |