Patent US3341646A successfully refreshed from Google Patents.
US3341646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of de-molding polyurethane plastics
Assignee: Bayer Corp
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Filing: 1965-10-04
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Granted: 1967-09-12
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Expires: 1985-10-04
Abstract
No abstract record available.
Inventors
- 👤 J W Britain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:56
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/56; B29C33/60; B29C33/62; B29C33/64; C; C08; C08G; C08G18/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A METHOD FOR SHAPING A POLYURETHANE WHICH COMPRISES PREPARING A SHAPING MEANS ADAPTED TO ALLOW GOOD RELEASE OF THE POLYURETHANE THEREFROM, AT LEAST THE SHAPING SURFACE OF WHICH IS CONSTRUCTED OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF A POLYTETRAHALOETHYLENE AND POLYPROPYLENE POLYMER BY COATING THE SAID SHAPING SURFACE WITH A LAYER OF AN ORGANO-SILICONE OIL, MIXING AN ORGANIC COMPOUND CONTAINING AT LEAST TWO REACTIVE HYDROGEN ATOMS AS DETERMINED BY THE ZEREWITINOFF METHOD WITH AN ORGANIC POLYISOCYANATE, CHARGING THE RESULTING MIXTURE ONTO THE SHAPING SURFACE, ALLOWING SUFFICIENT REACTION TO TAKE PLACE TO YIELD A SOLID POLYURETHANE AND REMOVING THE RESULTING THERMOPLASTIC POLYURETHANE FROM THE SHAPING SURFACE.
Claim 2
Independent Claim
107 words
A METHOD FOR SHAPING A POLYURETHANE WHICH COMPRISES PREPARING A SHAPING MEANS ADAPTED TO ALLOW GOOD RELEASE OF THE POLYURETHANE THEREFROM, AT LEAST THE SHAPING SURFACE OF WHICH IS CONSTRUCTED OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF A POLYTETRAHALOETHYLENE AND POLYPROPYLENE POLYMER BY COATING THE SAID SHAPING SURFACE WITH A LAYER OF AN ORGANO-SILICONE OIL, MIXING AN ORGANIC COMPOUND CONTAINING AT LEAST TWO REACTIVE HYDROGEN ATOMS AS DETERMINED BY THE ZEREWITINOFF METHOD WITH AN ORGANIC POLYISOCYANATE, CHARGING THE RESULTING MIXTURE ONTO THE SHAPING SURFACE, ALLOWING SUFFICIENT REACTION TO TAKE PLACE TO YIELD A SOLID POLYURETHANE AND REMOVING THE RESULTING THERMOPLASTIC POLYURETHANE FROM THE SHAPING SURFACE.
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) | 1970-09-11 | 1971-03-13 | 1971-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-11 | 1975-03-13 | 1975-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-11 | 1979-03-13 | 1979-09-12 | $7700.00 | Window Closed / Lapsed |