Patent US3230199A successfully refreshed from Google Patents.
US3230199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethanes cured with isocyanates and peroxides or sulphur
Assignee: Bayer AG
•
Filing: 1960-09-28
•
Granted: 1966-01-18
•
Expires: 1980-09-28
Abstract
No abstract record available.
Inventors
- 👤 Muhlhausen Cornelius
- 👤 Karl L Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:34
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/83; C08G18/87; C08G18/08; C08G18/10; C08G18/86; Y; Y10; Y10S; Y10S528/00; Y10S528/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A PROCESS FOR THE PREPARATION OF POLYURETHANE PLASTICS WHICH COMPRISES MIXING AN ISOCYANATE-MODIFIED PREPOLYMER OBTAINED BY A PROCESS WHICH COMPRISES REACTING AN ORGANIC POLYISOCYANATE WITH AN EXCESS OF AN ORGANIC COMPOUND CONTAINING AT LEAST TWO ACTIVE HYDROGEN CONTAINING GROUPS AS DETERMINED BY THE ZEREWITINOFF METHOD AND HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 750 WITH AN ORGANIC POLYISOCYANATE AND AN EFFECTIVE AMOUNT OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF ORGANIC PEROXIDES AND SULFUR AND HEATING THE RESULTING MIXTURE IN A MOLD TO FORM A HARD POLYURETHANE PLASTIC.
Claim 2
Dependent Claim
90 words
A PROCESS FOR THE PREPARATION OF POLYURETHANE PLASTICS WHICH COMPRISES MIXING AN ISOCYANATE-MODIFIED PREPOLYMER OBTAINED BY A PROCESS WHICH COMPRISES REACTING AN ORGANIC POLYISOCYANATE WITH AN EXCESS OF AN ORGANIC COMPOUND CONTAINING AT LEAST TWO ACTIVE HYDROGEN CONTAINING GROUPS AS DETERMINED BY THE ZEREWITINOFF METHOD AND HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 750 WITH AN ORGANIC POLYISOCYANATE AND AN EFFECTIVE AMOUNT OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF ORGANIC PEROXIDES AND SULFUR AND HEATING THE RESULTING MIXTURE IN A MOLD TO FORM A HARD POLYURETHANE PLASTIC.
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) | 1969-01-17 | 1969-07-19 | 1970-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-17 | 1973-07-19 | 1974-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-17 | 1977-07-19 | 1978-01-18 | $7700.00 | Window Closed / Lapsed |