US3156748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing molded articles of sponge polyurethane
Assignee: Individual
•
Filing: 1961-11-07
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Granted: 1964-11-10
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Expires: 1981-11-07
Abstract
No abstract record available.
Inventors
- 👤 Roth Jacques
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:49
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C33/00; B29C33/56; B29C33/60; B29C33/62; B29C44/005; B29C44/02; B29C44/12; B29C44/14; B29C33/68; B29C37/00; B29C37/0025; B29C37/0028; B29K; B29K2075/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
IN A METHOD OF MOLDING ARTICLES OF SPONGE POLYURETHANE BY MEANS OF POLYMERIZATION OF ITS COMPONENTS IN A HEATED MOLD, SAID METHOD TENDING TO FORM A SKIN ON THE POLYURETHANE ARTICLE, THE STEPS OF APPLYING TO THE INNER WALLS OF A MOLD A SOLUTION OF A MATERIAL ADHERING TO SAID SKIN FORMED ON SAID ARTICLE, REMOVING THE SOLVENT OF SAID SOLUTION TO FORM A DRY BASE FILM ON THE INNER WALLS OF SAID MOLD, FEEDING POLYURETHANE SPONGE MATERIAL INTO SAID MOLD TO FORM A MOLDED ARTICLE AND SUBJECTING SAID SPONGE MATERIAL TO A TEMPERATURE OF ABOUT 100*C. FOR A TIME PERIOD OF ABOUT 5 TO 7 MINUTES IN ORDER TO OBTAIN A PRELIMINARY POLYMERIZATION, REMOVING SAID MOLDED ARTICLE FROM SAID MOLD WITHOUT SAID SKIN FORMED THEEON, REMOVING SAID BASE FILM JOINTLY WITH SAID SKIN FOMRED ON THE OUTSIDE OF SAID MOLDED ARTICLE AND ADHERING TO SAID BASE FILM AND SUBJECTING SAID MOLDED ARTICLE TO A SECOND HEATING FOR A FINAL POLYMERIAZTION.
Claim 2
Dependent Claim
161 words
IN A METHOD OF MOLDING ARTICLES OF SPONGE POLYURETHANE BY MEANS OF POLYMERIZATION OF ITS COMPONENTS IN A HEATED MOLD, SAID METHOD TENDING TO FORM A SKIN ON THE POLYURETHANE ARTICLE, THE STEPS OF APPLYING TO THE INNER WALLS OF A MOLD A SOLUTION OF A MATERIAL ADHERING TO SAID SKIN FORMED ON SAID ARTICLE, REMOVING THE SOLVENT OF SAID SOLUTION TO FORM A DRY BASE FILM ON THE INNER WALLS OF SAID MOLD, FEEDING POLYURETHANE SPONGE MATERIAL INTO SAID MOLD TO FORM A MOLDED ARTICLE AND SUBJECTING SAID SPONGE MATERIAL TO A TEMPERATURE OF ABOUT 100*C. FOR A TIME PERIOD OF ABOUT 5 TO 7 MINUTES IN ORDER TO OBTAIN A PRELIMINARY POLYMERIZATION, REMOVING SAID MOLDED ARTICLE FROM SAID MOLD WITHOUT SAID SKIN FORMED THEEON, REMOVING SAID BASE FILM JOINTLY WITH SAID SKIN FOMRED ON THE OUTSIDE OF SAID MOLDED ARTICLE AND ADHERING TO SAID BASE FILM AND SUBJECTING SAID MOLDED ARTICLE TO A SECOND HEATING FOR A FINAL POLYMERIAZTION.
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) | 1967-11-10 | 1968-05-11 | 1968-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-10 | 1972-05-11 | 1972-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-10 | 1976-05-11 | 1976-11-10 | $7700.00 | Window Closed / Lapsed |