US2657971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impression material
Assignee: Dental Perfection Co
•
Filing: 1951-12-10
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Granted: 1953-11-03
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Expires: 1971-12-10
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Lochridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:21
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
IMPRESSION TAKING MATERIAL COMPRISING A GEL FORMING AGENT HAVING AN ACID RADICAL SELECTED FROM THE GROUP CONSISTING OF ALGINIC, PECTIC AND CARBOXYMETHYL CELLULOSE ACIDS, AN INORGANIC SALT OF THE CLASS CONSISTING OF CALCIUM AND LEAD SALTS HAVING A METALLIC ION REACTIVE WITH SAID ACID RADICAL OF THE GEL FORMING AGENT OT PRODUCE A WATER INSOLUBLE GEL, AND AN ALKALI METAL SALT OF A TETRA CARBOXY ACID OF ETHYLENE DIAMINE AS A RETARDER FOR SUCH REACTION.
Claim 2
Dependent Claim
75 words
IMPRESSION TAKING MATERIAL COMPRISING A GEL FORMING AGENT HAVING AN ACID RADICAL SELECTED FROM THE GROUP CONSISTING OF ALGINIC, PECTIC AND CARBOXYMETHYL CELLULOSE ACIDS, AN INORGANIC SALT OF THE CLASS CONSISTING OF CALCIUM AND LEAD SALTS HAVING A METALLIC ION REACTIVE WITH SAID ACID RADICAL OF THE GEL FORMING AGENT OT PRODUCE A WATER INSOLUBLE GEL, AND AN ALKALI METAL SALT OF A TETRA CARBOXY ACID OF ETHYLENE DIAMINE AS A RETARDER FOR SUCH REACTION.
References Cited (Backward Citations)
GB324638A
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US2240957A
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US2308692A
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US2331858A
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US2390137A
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US2499676A
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US2422497A
Cited
US2495767A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |