US3751391A
Expired / Lapsed
US
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Zinc oxide-poly(acrylic acid)surgical cements
Assignee: National Research Development Corp UK
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Filing: 1971-10-28
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Granted: 1973-08-07
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Expires: 1991-10-28
Abstract
Abstract DENTAL CEMENTS ARE PREPARED BY MIXING A SURGICAL GRADE METAL OXIDE POWDER WITH A WATER-SOLUBLE POLYMER OF ACRYLIC ACID AND WATER TO GIVE A PLASTIC MASS THAT RAPIDLY HARDENS. THE CEMENTS THUS PRODUCED HAVE GREATER ADHESION AND CAUSE LESS IRRITATION THAN CONVENTIONAL ZINC PHOSPHATE CEMENTS.
Inventors
- 👤 D Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:41
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/50; A61K6/54; A61K6/30; A61K6/80; A61K6/884; A61K6/887; A61K6/889
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |