US2733157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impression material and method of -
Assignee: —
•
Filing: —
•
Granted: 1956-01-31
•
Expires: 1973-01-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:25
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/90
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
134 words
AN IMPRESSION MATERIAL CONSISTING ESSENTIALLY ON A DRY WEIGHT BASIS OF ABOUT 2 PARTS OF A GEL-FORMING POLYHYDROX-POLYCARBOXY MATERIAL SELECTED FROM THE GROUP CONSISTING OF CARBOXY METHYL CELLULOSE, AN ALGINATE AND A PECTATE, ABOUT 5 PARTS OF A WATER-SOLUBLE MULTI-VALENT METAL SALT OF ETHYLENE DIAMINE TETRA-ACETIC ACID, THE MULTIVALENT SALT BEING CHELATED BY SAID ETHYLENE DIAMINE TETRAACETIC ACID TO PREVENT GELLING OF SAID GEL-FORMING MATERIAL ABOUT 2 PARTS OF A WATER-SOLUBLE DIVALENT METAL SALT WHICH RELEASES A DIVALENT METAL ION HAVING A HIGHER CHELATING STRENGTH FOR SAID ETHYLENE DIAMINE TETRA-ACETIC ACID THAN SAID MULTI-VALENT METAL SALT OF ETHYLENE DIAMINE TETRAACETIC ACID WHEREBY SAID MULTIVALENT METAL SALT ION IS DISPLACED BY SAID DIVALENT METAL ION FROM THE ETHYLENE DIAMINE TETRA-ACETIC ACID CHELATE TO PRECIPITATE THE GEL-FORMING MATERIAL, AND ABOUT 18 PARTS OF AN INERT FILLER.
References Cited (Backward Citations)
US2249694A
Cited
US2657971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-30 | 1959-08-01 | 1960-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-30 | 1963-08-01 | 1964-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-30 | 1967-08-01 | 1968-01-31 | $7700.00 | Window Closed / Lapsed |