Patent US4324838A successfully refreshed from Google Patents.
US4324838A
Expired / Lapsed
US
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Dry powder compositions of vermiculite lamellae and additives
Assignee: Imperial Chemical Industries Ltd
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Filing: 1979-08-14
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Granted: 1982-04-13
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Expires: 1999-08-14
Abstract
Abstract A free-flowing, dry powder composition comprising vermiculite lamellae (delaminated vermiculite); preferably the composition contains a solid particulate additive such as magnesium oxide.
Inventors
- 👤 Denis G. Ballard
- 👤 Richard M. Charnah
- 👤 John F. Droughton
- 👤 Graham R. Rideal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:30
CPC Classifications
C; C04; C04B; C04B30/00; C04B14/00; C04B14/02; C04B14/04; C04B14/20; C04B14/206; C04B14/208; Y; Y10; Y10S; Y10S106/00; Y10S106/03; Y10T; Y10T428/00; Y10T428/25; Y10T428/251; Y10T428/26; Y10T428/268; Y10T428/29; Y10T428/2911; Y10T428/2982
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
56 words
A free-flowing essentially dry powder composition comprising at least 10% by weight vermiculite lamellae said vermiculite lamellae being obtained from vermiculite which has been swollen by the action of aqueous solutions of salts and delaminated by mechanical shearing of the swollen granules to yield platelets having a thickness of less than one tenth of a micrometer.
Claim 2
Dependent Claim
56 words
A free-flowing essentially dry powder composition comprising at least 10% by weight vermiculite lamellae said vermiculite lamellae being obtained from vermiculite which has been swollen by the action of aqueous solutions of salts and delaminated by mechanical shearing of the swollen granules to yield platelets having a thickness of less than one tenth of a micrometer.
Claim 3
Dependent Claim
20 words
A free-flowing powder composition as claimed in claim 1 being the product of spray-drying an aqueous suspension comprising vermiculite lamellae.
Claim 4
Dependent Claim
44 words
A powder composition as claimed in claim 1 or claim 2 containing from 10% to 95% by weight of vermiculite and from 90% to 5% of one or more additives intended to enhance one or more properties of solid products made from the composition.
Claim 5
Dependent Claim
19 words
A powder composition as claimed in claim 1, 2 or 3 incorporating an additive being a compressive strength improver.
Claim 6
Dependent Claim
21 words
A powder composition as claimed in any one of claims 1 to 4 incorporating an additive being a water stability improver.
Claim 7
Dependent Claim
24 words
A powder composition as claimed in claim 3, 4 or 5 wherein the additive is a particulate material having a basic reaction in water.
Claim 8
Dependent Claim
18 words
A powder composition as claimed in claim 6 wherein the particulate material is a metal oxide or hydroxide.
Claim 9
Dependent Claim
13 words
A powder composition as claimed in claim 7 wherein the metal is magnesium.
Claim 10
Dependent Claim
13 words
A powder composition as claimed in claim 7 wherein the metal is calcium.
Claim 11
Dependent Claim
18 words
A powder composition as claimed in claim 3 which comprises at least 20% by weight of vermiculite lamellae.
Claim 12
Dependent Claim
26 words
A powder composition as claimed in claim 6 wherein the additive is a particulate material having a solubility in water of not greater than 10 g/l.
Claim 13
Dependent Claim
22 words
A powder composition as claimed in claim 11 wherein the solubility in water of the particulate material is less than 3 g/l.
Claim 14
Dependent Claim
31 words
A powder composition as claimed in claim 8 wherein the particulate material is magnesium oxide of which the particle size is within the range of from 1 micron to 20 microns.
Claim 15
Dependent Claim
23 words
A powder composition as claimed in any one of the preceding claims wherein the vermiculite particles are of size less than 50 microns.
Claim 16
Dependent Claim
17 words
A dry powder composition as claimed in claim 1 comprising additionally an inorganic oxide or oxy-acid salt.
Claim 17
Dependent Claim
15 words
A dry powder composition as claimed in claim 1 comprising additionally a common filler material.
Claim 18
Dependent Claim
17 words
A dry powder composition as claimed in claim 1 comprising additionally a naturally occurring particulate earth material.
Claim 19
Dependent Claim
15 words
A dry powder composition as claimed in claim 1 comprising additionally a powdered organic material.
Claim 20
Dependent Claim
16 words
A dry powder composition as claimed in claim 1 comprising additionally particles which are hollow microspheres.
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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) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |