US2678280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gel point indicating impression materials
Assignee: Dental Perfection Co
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Filing: 1952-03-21
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Granted: 1954-05-11
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Expires: 1972-03-21
Abstract
No abstract record available.
Inventors
- 👤 Stanley E Noyes
- 👤 Edwin H Lochridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:20
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A DENTAL IMPRESSION MATERIAL COMPRISING A GEL FORMING AGENT SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS HAVING CARBOXYLIC ACID GROUPS AND THE SALTS OF SUCH COMPOUNDS, A COMPOUND OF A POLYBASIC METAL CHEMICALLY REACTIVE WITH SAID AGENT IN SOLUTION AND PRESENT IN SAID MATERIAL IN AN AMOUNT SUFFICIENT TO FORM BY REACTION WITH SAID AGENT AN ELASTIC GEL AT A GEL POINT HAVING DETERMINABLE PH VALUE NOT LESS THAN ABOUT 6, AND AN INDICATOR COMPOUND UNIFORMLY DISPERSED IN SAID MATERIAL AND HAVING PREDETERMINED COLOR CHANGEABILITY IN RELATION TO SAID PH VALUE SO THAT AS SAID GEL POINT IS REACHED, DISTINCT COLOR CHANGEABILITY IS IMPARTED TO THE IMPRESSION MATERIAL.
Claim 2
Dependent Claim
108 words
A DENTAL IMPRESSION MATERIAL COMPRISING A GEL FORMING AGENT SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS HAVING CARBOXYLIC ACID GROUPS AND THE SALTS OF SUCH COMPOUNDS, A COMPOUND OF A POLYBASIC METAL CHEMICALLY REACTIVE WITH SAID AGENT IN SOLUTION AND PRESENT IN SAID MATERIAL IN AN AMOUNT SUFFICIENT TO FORM BY REACTION WITH SAID AGENT AN ELASTIC GEL AT A GEL POINT HAVING DETERMINABLE PH VALUE NOT LESS THAN ABOUT 6, AND AN INDICATOR COMPOUND UNIFORMLY DISPERSED IN SAID MATERIAL AND HAVING PREDETERMINED COLOR CHANGEABILITY IN RELATION TO SAID PH VALUE SO THAT AS SAID GEL POINT IS REACHED, DISTINCT COLOR CHANGEABILITY IS IMPARTED TO THE IMPRESSION MATERIAL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-10 | 1957-11-09 | 1958-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-10 | 1961-11-09 | 1962-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-10 | 1965-11-09 | 1966-05-11 | $7700.00 | Window Closed / Lapsed |