Patent US2780606A successfully refreshed from Google Patents.
US2780606A
Expired / Lapsed
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Process for the preparation of rubber and plastic materials of cellular structure
Assignee: Bayer AG
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Filing: 1951-08-22
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Granted: 1957-02-05
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Expires: 1971-08-22
Abstract
No abstract record available.
Inventors
- 👤 Hoppe Peter
- 👤 Pfeffer Hans
- 👤 Muller Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:20
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
IN THE PROCESS FOR THE PREPARATION OF PLASTIC MATERIALS OF CELLULAR STRUCTURE, BY CONTACTING WITH A HEATDECOMPOSABLE SUBSTANCE, A MIXTURE OF A POLYESTER AND A POLYISOCYANATE, THE IMPROVEMENT WHICH COMPRISES EMPLOYING AS THE HEAT DECOMPOSABLE SUBSTANCE A MATERIAL SELECTED FROM THE GROUP CONSISTING OF (1) MIXTURES AND (2) SALTS OF OXALIC ACID WIHT DICYANDIAMIDE SAID OXALIC ACID AND DICYANDIAMIDE BEING PRESENT IN EQUIMOLECULAR QUANTITIES IN AN AMOUNT OF ABOUT 3-25% BASED UPON SAID PLASTIC MATERIAL.
Claim 2
Dependent Claim
75 words
IN THE PROCESS FOR THE PREPARATION OF PLASTIC MATERIALS OF CELLULAR STRUCTURE, BY CONTACTING WITH A HEATDECOMPOSABLE SUBSTANCE, A MIXTURE OF A POLYESTER AND A POLYISOCYANATE, THE IMPROVEMENT WHICH COMPRISES EMPLOYING AS THE HEAT DECOMPOSABLE SUBSTANCE A MATERIAL SELECTED FROM THE GROUP CONSISTING OF (1) MIXTURES AND (2) SALTS OF OXALIC ACID WIHT DICYANDIAMIDE SAID OXALIC ACID AND DICYANDIAMIDE BEING PRESENT IN EQUIMOLECULAR QUANTITIES IN AN AMOUNT OF ABOUT 3-25% BASED UPON SAID PLASTIC MATERIAL.
References Cited (Backward Citations)
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Cited
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Cited
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US2613189A
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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) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |