US3793042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulating monolithic refractory
Assignee: Premier Refractories and Chemicals Inc
•
Filing: 1970-12-24
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Granted: 1974-02-19
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Expires: 1990-12-24
Abstract
Abstract An insulating, moldable monolithic refractory material for lining furnaces and the method of producing the same is disclosed. The material comprises diatomaceous earth which has been calcined for maximum volume stability, bentonite or other plastic clay materials and water. Also included may be expanded perlite for its insulating and strengthening characteristics and aluminum phosphate for its binding effect.
Inventors
- 👤 L Jacobs
- 👤 R Fisher
- 👤 F Felice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:00
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/6306; C04B35/6309; C04B35/01; C04B35/14; C04B35/66; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/34; C04B2235/3427
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
22 words
A refractory composition as recited in claim 1 wherein said calcined diatomaceous earth has a particle size screen analysis essentially as follows:
Claim 2
Dependent Claim
20 words
A plastic refractory composition as recited in claim 1 and further including up to 10 parts by weight expanded perLite.
Claim 3
Dependent Claim
20 words
A plastic refractory composition as recited in claim 3 and further including up to 10 parts by weight aluminum phosphate.
Claim 4
Dependent Claim
34 words
A refractory composition as recited in claim 3 wherein said expanded perlite has been expanded in the temperature range of 1, 600*F to 2,100*F and has a particle size screen analysis essentially as follows:
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |