Patent US5661339A successfully refreshed from Google Patents.
US3129270A
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US
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Method of molding polyurethane foam articles having improved surface characteristics
Assignee: Davidson Rubber Co Inc
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Filing: 1962-04-05
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Granted: 1964-04-14
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Expires: 1982-04-05
Abstract
No abstract record available.
Inventors
- 👤 Bruce G Hood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:08
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/3415; B29C33/00; B29C33/02; B29K; B29K2075/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
THE METHOD OF MOLDING POLYURETHANE FOAMS WHICH COMPRISES PREPARING A FOAM MIXTURE IN THE LIQUID STATE, POURING SAID MIXTURE PRIOR TO FOAMING INTO A MOLD IN AN AMOUNT SUFFICIENT TO COVER THE BOTTOM SURFACE THEREOF, CLOSING SAID MOLD, ALLOWING SAID MIXTURE TO REACT AND RISE THEREBY FILLING SAID MOLD WITH FOAM, AND THEREAFTER APPLYING HEAT TO SAID MOLD IN ORDER TO CURE SAID FOAM, SAID HEAT BEING APPLIED FIRST TO THE UPPER PORTION OF SAID FOAM AND THEN TO THE BOTTOM PORTION THEREOF IN A MANNER COUNTER CURRENT TO THE RISING FOAM, WHEREBY A MOLDED ARTICLE OF IMPROVED SURFACE CHARACTERISTICS IS OBTAINED.
Claim 2
Independent Claim
102 words
THE METHOD OF MOLDING POLYURETHANE FOAMS WHICH COMPRISES PREPARING A FOAM MIXTURE IN THE LIQUID STATE, POURING SAID MIXTURE PRIOR TO FOAMING INTO A MOLD IN AN AMOUNT SUFFICIENT TO COVER THE BOTTOM SURFACE THEREOF, CLOSING SAID MOLD, ALLOWING SAID MIXTURE TO REACT AND RISE THEREBY FILLING SAID MOLD WITH FOAM, AND THEREAFTER APPLYING HEAT TO SAID MOLD IN ORDER TO CURE SAID FOAM, SAID HEAT BEING APPLIED FIRST TO THE UPPER PORTION OF SAID FOAM AND THEN TO THE BOTTOM PORTION THEREOF IN A MANNER COUNTER CURRENT TO THE RISING FOAM, WHEREBY A MOLDED ARTICLE OF IMPROVED SURFACE CHARACTERISTICS IS OBTAINED.
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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) | 1967-04-14 | 1967-10-14 | 1968-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-14 | 1971-10-14 | 1972-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-14 | 1975-10-14 | 1976-04-14 | $7700.00 | Window Closed / Lapsed |