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Patent US3560415A successfully refreshed from Google Patents.
US3560415A
Expired / Lapsed
US
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Cellular polyurethane plastics
Assignee: Bayer AG
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Filing: 1968-02-27
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Granted: 1971-02-02
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Expires: 1988-02-27
Abstract
Abstract FOAM PALSTICS BASED ON COMPOUNDS WITH REACTIVE HYDROGEN ATOMS, ORGANIC POLYISOCYANATES, AND WATER AS BLOWING AGENT BY THE SINGLE STAGE OR MULTISTAGE PROCESS, IN WHICH FOAMING WITH POLYISOCYANATES AND WATER TAKES PLACE IN THE PRESENCE OF COMPOUNDS WITH AT LEAST ONE AZIRIDINE RING, THE NITROGEN ATOM OF WHICH IS LINKED TO A METHYLENE GROUP WHICH MAY BE ALKYLATED OR ARYLATED, WHICH AZIRIDINE COMPOUNDS MAY ALREADY HAVE A HIGH MOLECULAR WEIGHT AND WHICH, AT LEAST IN THE CASES WHERE ONLY ONE AZIRIDINE RING IS PRESENT IN THE MOLECULE, STILL HAVE AT LEAST ONE HYDROGEN ATOM WHICH IS REACTIVE WITH ISOCYANATES.
Inventors
- 👤 Gerhard Grogler
- 👤 Erwin Windemuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:37
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/2805; C08G18/285; C08G18/2875; C08G18/08; C08G18/16; C08G18/18; C08G18/20; C08G18/2009; C08G18/2018; C08G18/2865; C08G18/30; C08G18/32; C08G18/3225; C08G18/3246
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |