Patent US2816873A successfully refreshed from Google Patents.
US2816873A
Expired / Lapsed
US
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Impression materials and their production
Assignee: Bayer AG
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Filing: 1954-04-14
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Granted: 1957-12-17
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Expires: 1974-04-14
Abstract
No abstract record available.
Inventors
- 👤 Nogradi Josef
- 👤 Becker Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:29
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
AN IMPRESSION MATERIAL ADAPTED FOR USE IN TAKING DENTAL IMPRESSION CONSISTING ESSENTIALLY OF A MIXTURE CONSISTING OF (1) A FINELY DIVIDED WATER SOLUBLE SALT OF A POLY VALENT METAL SAID METALLIC SALT BEING CAPABLE OF FORMING GELS WITH ALGINATES, THE PARTICLES OF SAID METALLIC SALT BEING COATED WITH AN ORGANIC FILM-FORMING SUBSTANCE BEING INSOLUBLE IN WATER AND SOLUBLE IN ORGANIC SOLVENTS, AND SELECTED FROM THE GROUP CONSISTING OF A CHLORINATED RUBBER, A CYCLIZED RUBBER AND A VINYL CHLORIDE COPOLYMER AND (11) A WATER SOLUBLE ALGINATE.
Claim 2
Dependent Claim
85 words
AN IMPRESSION MATERIAL ADAPTED FOR USE IN TAKING DENTAL IMPRESSION CONSISTING ESSENTIALLY OF A MIXTURE CONSISTING OF (1) A FINELY DIVIDED WATER SOLUBLE SALT OF A POLY VALENT METAL SAID METALLIC SALT BEING CAPABLE OF FORMING GELS WITH ALGINATES, THE PARTICLES OF SAID METALLIC SALT BEING COATED WITH AN ORGANIC FILM-FORMING SUBSTANCE BEING INSOLUBLE IN WATER AND SOLUBLE IN ORGANIC SOLVENTS, AND SELECTED FROM THE GROUP CONSISTING OF A CHLORINATED RUBBER, A CYCLIZED RUBBER AND A VINYL CHLORIDE COPOLYMER AND (11) A WATER SOLUBLE ALGINATE.
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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) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |