Patent US4286415A successfully refreshed from Google Patents.
US3801433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling pitch in paper using amine coated clays
Assignee: Imerys Minerals Ltd
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Filing: 1971-10-12
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Granted: 1974-04-02
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Expires: 1991-10-12
Abstract
Abstract In the manufacture of paper, the deposition of pitch is reduced by adding to the pulp from which paper is to be made a quantity of a clay pigment which has been coated with an organic material which adheres strongly to the clay pigment and which renders the surface of the particles of said clay pigment oleophilic.
Inventors
- 👤 W Windle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:25
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/40; C09C1/42; D; D21; D21H; D21H17/00; D21H17/63; D21H17/67; D21H17/69; D21H21/00; D21H21/02; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/80; Y; Y10; Y10S; Y10S162/00; Y10S162/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
21 words
A method according to claim 1, wherein the coated clay pigment is added to the pulp in a substantially dry condition.
Claim 2
Dependent Claim
23 words
A method according to claim 1, wherein the coated clay pigment is added to the pulp at the first beating or refining stage.
Claim 3
Dependent Claim
14 words
A method according to claim 1, wherein the pulp is formed predominantly from gymnosperms.
Claim 4
Dependent Claim
15 words
A method according to claim 1, wherein the pulp is obtained by the sulphite process.
Claim 5
Dependent Claim
35 words
A method according to claim 1, wherein the coated clay pigment is added to the wood pulp at a dose rate of from 0.8 percent to 2.5 percent by weight of bone dry wood pulp.
Claim 6
Dependent Claim
129 words
Paper including a filler which comprises a clay pigment which has been coated with 0.5 to 5 percent based on the weight of said clay pigment of an organic material which adheres strongly to the clay pigment and which renders the surface of the particles of said clay pigment oleophilic, the amount of said clay pigment being not more than 7.5 percent by weight of the bone dry pulp and used to make said paper, said organic material being selected from the group consisting of organic amines containing from six to 25 carbon atoms, water-soluble salts of organic amines containing from six to 25 carbon atoms, reaction products of organic amines containing from six to 25 carbon atoms with an alkylene oxide, alkyl pyridinium salts and quaternary ammonium salts.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |