Patent US3055845A successfully refreshed from Google Patents.
US3055845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane plastics
Assignee: Bayer AG
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Filing: 1960-01-12
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Granted: 1962-09-25
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Expires: 1980-01-12
Abstract
No abstract record available.
Inventors
- 👤 Merten Rudolf
- 👤 Loew Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:42
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/22; C08G18/24; C08G18/242
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
THE METHOD OF CATALYZING THE REACTION BETWEEN AN ORGANIC ISOCYANTE AND AN ORGANIC COMPOUND CONTAINING AT LEAST ONE ACTIVE HYDROGEN CONTAINING GROUP AS DETERMINED BY THE ZEREWITTINOFF METHOD WHICH COMPRISES MIXING SAID MATERIALS IN THE PRESENCE OF A CATALYTIC AMOUNT OF AN ORGANO-TIN CHELATE CHELATED WITH AN ORGANIC CHELATING AGENT AND CONTAINING AT LEAST ONE CARBON TO TIN BOND.
Claim 2
Independent Claim
59 words
THE METHOD OF CATALYZING THE REACTION BETWEEN AN ORGANIC ISOCYANTE AND AN ORGANIC COMPOUND CONTAINING AT LEAST ONE ACTIVE HYDROGEN CONTAINING GROUP AS DETERMINED BY THE ZEREWITTINOFF METHOD WHICH COMPRISES MIXING SAID MATERIALS IN THE PRESENCE OF A CATALYTIC AMOUNT OF AN ORGANO-TIN CHELATE CHELATED WITH AN ORGANIC CHELATING AGENT AND CONTAINING AT LEAST ONE CARBON TO TIN BOND.
References Cited (Backward Citations)
US2933462A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |