Patent US4253983A successfully refreshed from Google Patents.
US4253983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paraffin compositions having improved heat reservoir
Assignee: Individual
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Filing: 1978-03-16
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Granted: 1981-03-03
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Expires: 1998-03-16
Abstract
Abstract A paraffin composition that is solid at 25° C. and has an improved heat reservoir by virtue of being combined with inert solid material, wherein the paraffin composition contains from 25 to 55% by weight of at least two constituents comprising aluminium or one of its oxides or silicates, and magnesium or one of its oxides or silicates.
Inventors
- 👤 Marie J. M. P. Blanie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:52
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/06; C09K5/063
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
104 words
A paraffin composition that can be used as a shapable heat casing constituent, which is solid at 40° C., and has an improved heat reservoir by virtue of being combined with inert solid material, comprising from 45 to 65% by weight of paraffin and from 35 to 55% by weight of at least two categories of constituents, the first category of constituents improving the thermal conductivity of the composition and being selected from the group consisting of magnesia, aluminum and alumina, and the second category of constituents improving the plasticity of the composition and being selected from the group consisting of kaolin and talc.
Claim 2
Dependent Claim
104 words
A paraffin composition that can be used as a shapable heat casing constituent, which is solid at 40° C., and has an improved heat reservoir by virtue of being combined with inert solid material, comprising from 45 to 65% by weight of paraffin and from 35 to 55% by weight of at least two categories of constituents, the first category of constituents improving the thermal conductivity of the composition and being selected from the group consisting of magnesia, aluminum and alumina, and the second category of constituents improving the plasticity of the composition and being selected from the group consisting of kaolin and talc.
Claim 3
Dependent Claim
18 words
The composition of claim 1 consisting essentially of said paraffin and said at least two categories of constituents.
Claim 4
Dependent Claim
15 words
The composition according to claim 1, containing from 2 to 15% by weight of magnesia.
Claim 5
Dependent Claim
25 words
The composition according to claim 1, containing from 15 to 50% by weight of a constituent selected from the group consisting of aluminium and alumina.
Claim 6
Dependent Claim
15 words
The composition according to claim 4, containing from 23 to 46% by weight of alumina.
Claim 7
Dependent Claim
15 words
The composition according to claim 4, containing from 18 to 38% by weight of aluminium.
Claim 8
Dependent Claim
19 words
The composition according to claim 1, containing from 5 to 10% by weight of the first category of constituents.
Claim 9
Dependent Claim
19 words
The composition according to claim 7, containing from 7 or 9% by weight of the first category of constituents.
Claim 10
Dependent Claim
15 words
The composition according to claim 1, containing from 8 to 15% by weight of kaolin.
Claim 11
Dependent Claim
15 words
The composition according to claim 9, containing from 10 to 12% by weight of kaolin.
Claim 12
Dependent Claim
12 words
The composition according to claim 1, which is solid at 50° C.
Claim 13
Dependent Claim
16 words
The composition according to claim 11, wherein the paraffin is a mixture of n-docosane and n-tetracosane.
Claim 14
Dependent Claim
33 words
The composition according to claim 12, wherein the proportion of n-docosane with respect to the total weight of paraffin is from 75 to 85%, and that of n-tetracosane is from 15 to 25%.
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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) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |