US3882080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-hardening compound, particularly for dental-medical application
Assignee: SIH Stiftung and Co Industrie Holding KG
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Filing: 1974-02-26
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Granted: 1975-05-06
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Expires: 1994-02-26
Abstract
Abstract Dental cements contain zinc oxide and an aqueous solution of a polymer of an unsaturated alpha, beta-dicarboxylic acid.
Inventors
- 👤 Werner Schmitt
- 👤 Robert Purrmann
- 👤 Peter Jochum
- 👤 Wolf-Dieter Zahler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:46
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/70; A61K6/71; A61K6/80; A61K6/884; A61K6/887; A61K6/889; Y; Y10; Y10S; Y10S526/00; Y10S526/936
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
A PRE-MIXED DENTAL PREPARATION FOR THE PREPARATION OF A SELF-HARDENING COMPOSITION WHEN MIXED WITH WATER CONSISTING ESSENTIALLY OF ZINC OXIDE AND A POLYMER OF AN UNSATURATED ALPHA, BETA-DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF HOMOPOLYMERS OF UNSATURATED ALPHA, BETA-DICARBOXYLIC ACIDS OF FOUR TO FIVE CARBON ATOMS AND COPOLYMERS OF SAID ACIDS WITH EACH OTHER AND WITH LESS THAN 10 MOL PERCENT OF AN UNSATURATED MONOCARBOXYLIC ACID, ACRYLAMIDE, METHYACYLIC ESTER OR METHACRYLIC AMIDE WHEREIN THE WEIGHT RATIO OF ZINC OXIDE TO SAID POLYMER IS 20:1 TO 0.6:1.
Claim 2
Dependent Claim
87 words
A PRE-MIXED DENTAL PREPARATION FOR THE PREPARATION OF A SELF-HARDENING COMPOSITION WHEN MIXED WITH WATER CONSISTING ESSENTIALLY OF ZINC OXIDE AND A POLYMER OF AN UNSATURATED ALPHA, BETA-DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF HOMOPOLYMERS OF UNSATURATED ALPHA, BETA-DICARBOXYLIC ACIDS OF FOUR TO FIVE CARBON ATOMS AND COPOLYMERS OF SAID ACIDS WITH EACH OTHER AND WITH LESS THAN 10 MOL PERCENT OF AN UNSATURATED MONOCARBOXYLIC ACID, ACRYLAMIDE, METHYACYLIC ESTER OR METHACRYLIC AMIDE WHEREIN THE WEIGHT RATIO OF ZINC OXIDE TO SAID POLYMER IS 20:1 TO 0.6:1.
Claim 3
Dependent Claim
12 words
The pre-mixed preparation of claim 1 wherein the polymer is polymaleic acid.
Claim 4
Dependent Claim
12 words
The pre-mixed preparation of claim 1 wherein the polymer is polyitaconic acid.
Claim 5
Dependent Claim
10 words
The pre-mixed preparation of claim 1 additionally containing polyacrylic acid.
Claim 6
Dependent Claim
13 words
The pre-mixed prEparation of claim 1 wherein said ratio is 0.8:1 to 10:1.
Claim 7
Dependent Claim
19 words
The pre-mixed preparation of claim 1 wherein the weight ratio of zinc oxide to polymer is 5:1 to 1.5:1.
Claim 8
Dependent Claim
14 words
The pre-mixed preparation of claim 1 wherein said ratio is 2: 1 to 6.25:1.
References Cited (Backward Citations)
US3655605A
Cited
US3804794A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |