US4420306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tetraacrylic and tetramethacrylic esters and dental materials containing same
Assignee: Blendax GmbH
•
Filing: 1982-06-24
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Granted: 1983-12-13
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Expires: 2002-06-24
Abstract
Abstract Tetraacrylic acid and tetramethacrylic acid esters and dental restorative and filling materials containing the esters.
Inventors
- 👤 Jan A. Orlowski
- 👤 Helmar Wagner
- 👤 David V. Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:23
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/34; C08F20/36; A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
76 words
Tetraacrylic and tetramethacrylic acid esters of the general formula ##STR11## where R is a divalent (ar)aliphatic, cycloaliphatic, or aromatic group with 4 to 18 carbon atoms; R' is H or methyl; R" is a --CH═CH--, --CH 2 CH 2 --, --CH 2 CH 2 CH 2 --, --CH 2 CH 2 CH 2 CH 2 --, an optionally substituted or hydrogenated benzene group, a cyclohexane group, or a cis-norbornene group, and n is 2 or 3.
Claim 2
Dependent Claim
76 words
Tetraacrylic and tetramethacrylic acid esters of the general formula ##STR11## where R is a divalent (ar)aliphatic, cycloaliphatic, or aromatic group with 4 to 18 carbon atoms; R' is H or methyl; R" is a --CH═CH--, --CH 2 CH 2 --, --CH 2 CH 2 CH 2 --, --CH 2 CH 2 CH 2 CH 2 --, an optionally substituted or hydrogenated benzene group, a cyclohexane group, or a cis-norbornene group, and n is 2 or 3.
Claim 3
Dependent Claim
15 words
Compounds according to the general formula of claim 1, where R is a hexamethylene group.
Claim 4
Dependent Claim
16 words
Compounds according to the formula of claim 1, where R is a phenylene or toluylene group.
Claim 5
Dependent Claim
15 words
Compounds according to the formula of claim 1, where R is a methylene biscyclohexyl group.
Claim 6
Dependent Claim
15 words
Compounds according to the formula of claim 1, where R is a methylene bisphenyl group.
Claim 7
Dependent Claim
14 words
Compounds according to the formula of claim 1, where R is a tetramethylene group.
Claim 8
Dependent Claim
19 words
Compounds according to the formula of one of the claims 1 to 6, where R" is a --CH═CH-- group.
Claim 9
Dependent Claim
19 words
Compounds according to the formula of one of the claims 1 to 6, where R" is a benzene group.
Claim 10
Dependent Claim
19 words
Compounds according to the formula of one of the claims 1 to 6, where R" is a tetrahydrobenzene group.
Claim 11
Dependent Claim
19 words
Compounds according to the formula of one of the claims 1 to 6, where R" is a cyclohexane group.
Claim 12
Dependent Claim
37 words
Dental restorative and filling material containing at least one inorganic filler, at least one polymerization initiator, at least one polymerization accelerator, and at least one of the compounds according to one of the claims 1 to 6.
Claim 13
Dependent Claim
50 words
Dental restorative and filling material according to claim 11, containing the following components: 5 to 50% by weight of at least one of said compounds; 0,1 bis 5,0% by weight of at least one polymerization initiator and/or polymerization accelerator and 50 to 90% by weight of at least one filler.
References Cited (Backward Citations)
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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) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |