Patent US5120460A successfully refreshed from Google Patents.
US5120460A
Expired / Lapsed
US
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Dental cleaner materials
Assignee: GC Corp
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Filing: 1990-03-29
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Granted: 1992-06-09
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Expires: 2010-03-29
Abstract
Abstract A dental cleaner material comprises as a main component an aqueous solution containing 0.1 to 2.0% by weight of ethylenediaminetetraacetic acid or at least one of its alkali metal salts. The cleaner material is gelled by the addition of a carboxyvinyl polymer, carboxymethylcellulose or sodium carboxymethylcellulose as a raiser in viscosity showing thixotropy, further contains 0.01 to 0.3% by weight fo a p-hydroxybenzoic acid ester as an antibacterial agent, and is regulated to pH of 7.0±0.5.
Inventors
- 👤 Yasuhiro Asai
- 👤 Kiyoko Nakamura
- 👤 Masayuki Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:01
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/40; A61K8/44; A61K8/33; A61K8/37; A61K8/72; A61K8/73; A61K8/731; A61K8/81; A61K8/8141; A61K8/8147; A61Q; A61Q11/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
70 words
A smear layer removing composition consisting essentially of an aqueous solution containing 0.1 to 2.0% by weight of ethylenediaminetetraacetic acid or at least one of its alkali metal salts, 0.01% to 10% by weight of a carboxyvinyl polymer which thixotropically gels said solution, 0.01 to 0.3% by weight of an antibacterial agent, about 87.7-99.88% water and a pH regulating agent in an amount sufficient to bring the pH to 7.0±0.5.
Claim 2
Dependent Claim
70 words
A smear layer removing composition consisting essentially of an aqueous solution containing 0.1 to 2.0% by weight of ethylenediaminetetraacetic acid or at least one of its alkali metal salts, 0.01% to 10% by weight of a carboxyvinyl polymer which thixotropically gels said solution, 0.01 to 0.3% by weight of an antibacterial agent, about 87.7-99.88% water and a pH regulating agent in an amount sufficient to bring the pH to 7.0±0.5.
Claim 3
Dependent Claim
39 words
A smear layer removing composition as claimed in claim 1, wherein said antibacterial agent is a p-hydroxybenzoic acid ester expressed by the following general formula: ##STR2## wherein R stands for an alkyl group having 1 to 4 carbon atoms.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-09 | 1995-12-09 | 1996-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-09 | 1999-12-09 | 2000-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-09 | 2003-12-09 | 2004-06-09 | $7700.00 | Window Closed / Lapsed |