US2623808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental impression compositions
Assignee: Surgident Ltd
•
Filing: 1951-06-02
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Granted: 1952-12-30
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Expires: 1971-06-02
Abstract
No abstract record available.
Inventors
- 👤 Herbert G Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:31
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/90
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
90 words
A FINELY DIVIDED, VIRTUALLY DRY COMPOSITION FOR USE IN MAKING DENTAL IMPRESSION MATERIAL BY THE ADDITION OF WATER THERTO, COMPRISING, IN COMBINATION WITH ALGINATE AND INERT FILLER IN QUANTITIES SUFFICIENT TO PRODUCE A RESILIENT GEL: LEAD THIOSULFATE, BASIC ALUMINUM ACETATE AND AN ALKALI METAL SALT OF PYROPHOSPHORIC ACID, THE AMOUNT OF LEAD THIOSULFATE BY WEIGHT BEING GREATER THAN THE AGGREGATE WEIGHT OF THE ALUMINUM ACETATE AND ALKALI METAL SALT, AND NOT OVER ABOUT 1.5% OF A FLUORIDE OF A METAL FROM THE GROUP CONSISTING OF ZINC, BARIUM, CHROMIUM AND COPPER.
References Cited (Backward Citations)
US2165680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-30 | 1956-06-30 | 1956-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-30 | 1960-06-30 | 1960-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-30 | 1964-06-30 | 1964-12-30 | $7700.00 | Window Closed / Lapsed |