Patent US4911922A successfully refreshed from Google Patents.
US4911922A
Expired / Lapsed
US
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Pharmaceutical composition for use in desensitizing hypersensitive dentin
Assignee: Individual
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Filing: 1988-08-15
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Granted: 1990-03-27
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Expires: 2008-08-15
Abstract
Abstract Disclosed is a pharmaceutical composition for use in desensitizing hypersensitive dentin or eliminating odontalgia comprising N-methacryloyl aminosalicylic acid as an active ingredient. The composition may further include an unsaturated compound and a polymerization initiator optionally for retaining the desensitizing effect.
Inventors
- 👤 Eiichi Masuhara
- 👤 Hiroyasu Hosoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:30
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/60; A61K31/74; A61K31/765; A61K31/78; A61K6/00; A61K6/20; A61K6/30; A61K6/60; A61K6/62; A61P; A61P1/00; A61P1/02; A61P25/00; A61P25/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
70 words
A pharmaceutical composition for use in desensitizing dentin or eliminating odontalgia comprising N-methacryloyl aminosalicylic acid in an amount effective to desensitize hypersensitive dentin or to eliminate odontalgia at a place where enamel is cracked or broken, if retained or tightly adhered to the surface of the exposed affected dentin, as an endodontium protective coating, a compound having an unsaturated group, a polymerization initiator and a pharmaceutically acceptable carrier or diluent.
Claim 2
Dependent Claim
70 words
A pharmaceutical composition for use in desensitizing dentin or eliminating odontalgia comprising N-methacryloyl aminosalicylic acid in an amount effective to desensitize hypersensitive dentin or to eliminate odontalgia at a place where enamel is cracked or broken, if retained or tightly adhered to the surface of the exposed affected dentin, as an endodontium protective coating, a compound having an unsaturated group, a polymerization initiator and a pharmaceutically acceptable carrier or diluent.
Claim 3
Dependent Claim
14 words
A pharmaceutical composition of claim 1 wherein N-methacryloyl aminosalicylic acid is N-methacryloyl 5-aminosalicylic acid.
Claim 4
Dependent Claim
26 words
A pharmaceutical composition of claim 2 wherein the carrier or diluent is selected from the group consisting of acetone, ethyl alcohol, ethyl acetate and methyl methacrylate.
Claim 5
Dependent Claim
37 words
A pharmaceutical composition of claim 2 wherein the compound having the unsaturated group is selected from the group consisting of a compound having methacryl group such as methacrylate, dimethacrylate, trimethacrylate, tetramethacrylate, polymer thereof and a mixture thereof.
Claim 6
Dependent Claim
26 words
A pharmaceutical composition of claim 4 wherein the compound having the unsaturated group is methyl methacrylate, or a mixture thereof with polymethyl methacrylate or triethyleneglycol dimethacrylate.
Claim 7
Dependent Claim
23 words
A pharmaceutical composition of any one of the preceding claims 1 to 5 wherein the polymerization initiator is tri-n-butyl borane or camphor quinone.
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) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |