US4456711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of a powder mixture for surgical use
Assignee: Beiersdorf AG
•
Filing: 1982-07-14
•
Granted: 1984-06-26
•
Expires: 2002-07-14
Abstract
Abstract A powder mixture for surgical use, containing a methyl methacrylate homopolymer and/or copolymer powder, an X-ray contrast medium powder and a polymerization initiator, wherein the polymerization initiator is present as a combination product with the polymer powder or the X-ray contrast medium. This powder mixture is suitable for the preparation of surgical compositions which harden and are based on polymethyl methacrylate or its copolymers.
Inventors
- 👤 Hanns Pietsch
- 👤 Volker Hohmann
- 👤 Willi Eckloff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:23
CPC Classifications
C; C09; C09J; C09J4/00; C09J4/06; A; A61; A61L; A61L27/00; A61L27/40; A61L27/44; A61L27/446; A61B; A61B90/00; A61B90/39; A61L2430/00; A61L2430/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
67 words
In a process for the preparation of a powder mixture which comprises combining a polymerization initiator with a methylmethacrylate homopolymer and/or copolymer powder and an X-ray contrast medium, the improvement wherein the initiator is mixed with either the polymer powder or the X-ray contrast medium under conditions whereby the initiator coats said polymer powder or said X-ray contrast medium and, subsequently mixing the remainder of the ingredients".
Claim 2
Dependent Claim
67 words
In a process for the preparation of a powder mixture which comprises combining a polymerization initiator with a methylmethacrylate homopolymer and/or copolymer powder and an X-ray contrast medium, the improvement wherein the initiator is mixed with either the polymer powder or the X-ray contrast medium under conditions whereby the initiator coats said polymer powder or said X-ray contrast medium and, subsequently mixing the remainder of the ingredients".
Claim 3
Dependent Claim
24 words
A process as in claim 1, wherein the X-ray contrast medium is zirconium dioxide powder which is coated with benzoyl peroxide as the initiator.
Claim 4
Dependent Claim
15 words
A process as in claim 1, wherein the polymer powder is coated with benzoyl peroxide.
Claim 5
Dependent Claim
16 words
A process as in claim 1, wherein the content of the initiator is 1-50% by weight.
Claim 6
Dependent Claim
19 words
A process as in claim 1, wherein the content of X-ray contrast medium is up to 15% by weight.
Claim 7
Dependent Claim
19 words
A process as in claim 1, wherein the maximum particle diameter of said mixture is less than 200 micrometers.
References Cited (Backward Citations)
GB1532318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |