Patent US4485203A successfully refreshed from Google Patents.
US4485203A
Expired / Lapsed
US
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Production of vermiculite products and suspension for use therein
Assignee: Imperial Chemical Industries Ltd
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Filing: 1983-02-22
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Granted: 1984-11-27
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Expires: 2003-02-22
Abstract
Abstract A process for producing solid vermiculite products which are stable in water which comprises incorporating a urea-formaldehyde or melamine-formaldehyde resin in an aqueous suspension of vermiculite lamellae, shaping the suspension and removing water from the suspension, and curing the shaped composition by heating during and/or after removal of water from the suspension. The invention includes an aqueous suspension of vermiculite lamellae having a resin incorporated therein and a dry-powder mixture of vermiculite lamellae and a resin.
Inventors
- 👤 John Hutchinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:04
CPC Classifications
C; C04; C04B; C04B14/00; C04B14/02; C04B14/04; C04B14/20; C04B14/206; C04B14/208
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
16 words
An aqueous suspension of vermiculite lamellae having a urea-formaldehyde resin or a melamine-formaldehyde resin incorporated therein.
Claim 2
Dependent Claim
16 words
An aqueous suspension of vermiculite lamellae having a urea-formaldehyde resin or a melamine-formaldehyde resin incorporated therein.
Claim 3
Dependent Claim
30 words
An aqueous suspension as claimed in claim 1 wherein the amount of the resin is from 2% to 10% by weight based on the weight of vermiculite in the suspension.
Claim 4
Dependent Claim
25 words
An aqueous suspension as claimed in claim 1 or claim 2 wherein the major proportion of the vermiculite lamellae are of size below 50 microns.
Claim 5
Dependent Claim
13 words
An aqueous suspension as claimed in claim 1 which contains a viscosity-modifying agent.
Claim 6
Dependent Claim
15 words
An aqueous suspension as claimed in claim 4 wherein the viscosity-modifying agent is sodium pyrophosphate.
Claim 7
Dependent Claim
12 words
An aqueous suspension as claimed in claim 1 which contains a filler.
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) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |