US3959192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of ultrafine natural calcium carbonates as fillers in natural and synthetic polymers
Assignee: Omya AG
•
Filing: 1975-03-07
•
Granted: 1976-05-25
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Expires: 1995-03-07
Abstract
Abstract Filled polymer containing natural calcium carbonate having a statistical particle diameter of from 0.5 to 0.7 micron and average maximum diameter of from 3 to 4 microns.
Inventors
- 👤 Pierre Delfosse
- 👤 Alfred Bosshard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:44
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/24; C08K3/26; Y; Y10; Y10S; Y10S521/00; Y10S521/908
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
32 words
A filled polymer, the filler comprising ultrafine natural calcium carbonate having an average statistical particle diameter of from 0.5 to 0.7 μ and a maximum diameter of from 3 to 4 μ.
Claim 2
Dependent Claim
32 words
A filled polymer, the filler comprising ultrafine natural calcium carbonate having an average statistical particle diameter of from 0.5 to 0.7 μ and a maximum diameter of from 3 to 4 μ.
Claim 3
Dependent Claim
24 words
A filled polymer according to claim 1, wherein the polymer comprises rubber, a polyvinyl chloride-based foam, hard polyvinyl chloride or a polyvinyl chloride coating.
Claim 4
Dependent Claim
16 words
A filled polymer according to claim 1, wherein the filler is chalk produced from coccolith shells.
Claim 5
Dependent Claim
13 words
A filled polymer according to claim 1, wherein the filler is crystalline calcite.
Claim 6
Dependent Claim
15 words
A filled polymer according to claim 2 wherein the carbonate is chalk from coccolith shells.
Claim 7
Dependent Claim
13 words
A filled polymer according to claim 2 wherein the carbonate is crystalline calcite.
Claim 8
Dependent Claim
11 words
The filler polymer of claim 1 wherein the polymer comprises polychloroprene.
Claim 9
Dependent Claim
12 words
The filler polymer of claim 1 which is a polyvinyl chloride-based foam.
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) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |