US4427800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenolic resin for refractory uses
Assignee: Sumitomo Durez Co Ltd
•
Filing: 1982-02-12
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Granted: 1984-01-24
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Expires: 2002-02-12
Abstract
Abstract Refractory shaped articles are prepared by heating refractory mixes comprised of refractory particles and a liquid phenolic resole resin having a methylol group index of about 0.8 or less and a free moisture content of about 8 weight percent or less.
Inventors
- 👤 Masayuki Nakamura
- 👤 Masaaki Tsuriya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:22
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/013; C08; C08G; C08G8/00; C08G8/04; Y; Y10; Y10S; Y10S524/00; Y10S524/904
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
24 words
A phenolic resin for refractory uses, consisting essentially of a liquid phenolic resole resin having a methylol group index of about 0.8 or less.
Claim 2
Dependent Claim
24 words
A phenolic resin for refractory uses, consisting essentially of a liquid phenolic resole resin having a methylol group index of about 0.8 or less.
Claim 3
Dependent Claim
24 words
The phenolic resin of claim 1 wherein the liquid phenolic resole resin has a free moisture content of about 8 weight percent or less.
Claim 4
Dependent Claim
24 words
A refractory mix consisting essentially of refractory particles and a liquid phenolic resole resin haing a methylol group index of about 0.8 or less.
Claim 5
Dependent Claim
24 words
A refractory mix consisting essentially of refractory particles and a liquid phenolic resole resin haing a methylol group index of about 0.8 or less.
Claim 6
Dependent Claim
23 words
The refractory mix of claim 3 wherein the liquid phenolic resole resin has a free moisture content of about 8 percent or less.
Claim 7
Dependent Claim
56 words
A refractory mix consisting essentially of refractory particles and a liquid phenolic resole resin having a methylol group index of 0.1 to 0.6, and a free water content of less than 6 weight percent, in a proportion of about 1 to 25 parts by weight of liquid resole per 100 parts by weight of refractory material.
Claim 8
Dependent Claim
56 words
A refractory mix consisting essentially of refractory particles and a liquid phenolic resole resin having a methylol group index of 0.1 to 0.6, and a free water content of less than 6 weight percent, in a proportion of about 1 to 25 parts by weight of liquid resole per 100 parts by weight of refractory material.
Claim 9
Dependent Claim
13 words
The refractory mix of claim 5 wherein the refractory material comprises magnesia particles.
Claim 10
Dependent Claim
13 words
A refractory shaped article prepared by heating the refractory mix of claim 5.
Claim 11
Dependent Claim
13 words
A refractory shaped article prepared by heating the refractory mix of claim 6.
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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) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |