US3941610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnesium hydroxide-containing paper
Assignee: Dow Chemical Co
•
Filing: 1971-05-17
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Granted: 1976-03-02
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Expires: 1991-05-17
Abstract
Abstract Paper possessing outstanding opacity, whiteness and gloss characteristics containing a magnesium hydroxide pigment having about 1 to 5 weight per cent calcium ion concentration in solid solution therewith and methods of manufacturing such paper are provided. The pigment is contained either as a paper filler or as a component of a coating pigment composition.
Inventors
- 👤 John Maskal
- 👤 Ivan M. Thompson
- 👤 Henrik R. Heikel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:07
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/02; C09C1/028; D; D21; D21H; D21H17/00; D21H17/63; D21H17/67; D21H17/675; D21H19/00; D21H19/36; D21H19/38; D21H19/385; D21H21/00; D21H21/50; D21H21/52; C01; C01P; C01P2002/00; C01P2002/50; C01P2002/70; C01P2002/77; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/80; C01P2006/00; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
36 words
A pigment composition for use as a paper coating which comprises a magnesium hydroxide pigment having from about 1 to about 5 weight percent calcium ion concentration in solid solution and at least one binder material.
Claim 2
Dependent Claim
36 words
A pigment composition for use as a paper coating which comprises a magnesium hydroxide pigment having from about 1 to about 5 weight percent calcium ion concentration in solid solution and at least one binder material.
Claim 3
Dependent Claim
15 words
The pigment composition of claim 1 which also contains at least one other pigment material.
Claim 4
Dependent Claim
20 words
The pigment composition of claim 2 wherein the other pigment material is clay and the binder material is styrene-butadiene latex.
Claim 5
Dependent Claim
46 words
A pigment composition for use as a paper coating which comprises a magnesium hydroxide pigment having from about 1 to about 5 weight percent calcium ion concentration in solid solution and having from about 10 to about 25 weight percent of at least one binder material.
Claim 6
Dependent Claim
46 words
A pigment composition for use as a paper coating which comprises a magnesium hydroxide pigment having from about 1 to about 5 weight percent calcium ion concentration in solid solution and having from about 10 to about 25 weight percent of at least one binder material.
Claim 7
Dependent Claim
15 words
The pigment composition of claim 4 which also contains at least one other pigment material.
Claim 8
Dependent Claim
21 words
The pigment composition of claim 5 wherein the other pigment material is clay and the binder material is a styrene-butadiene latex.
References Cited (Backward Citations)
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US2049021A
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US2068039A
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US2066066A
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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) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |