US4111709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lute
Assignee: Coal Industry Patents Ltd
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Filing: 1978-02-01
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Granted: 1978-09-05
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Expires: 1998-02-01
Abstract
Abstract A lute for coke ovens and the like is of clay-like consistency and contains a blowing agent which produces gas at least within the temperature range 160° to 290° C, and can appreciably cut pollution.
Inventors
- 👤 David Watkin Price
- 👤 Newton John Hodges
- 👤 Robert Furley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:11
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B38/00; C04B38/02; C10; C10B; C10B25/00; C10B25/02; C10B25/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
55 words
A foamable lute of clay-like consistency in admixture with a blowing agent which yields gas formation at least within the temperature range 160° to 290° C., said lute comprising an admixture of clay or pressed colliery tailings, water and at least one element selected from the group consisting of shale, coke breeze or reclaimed lute.
Claim 2
Dependent Claim
61 words
A foamable lute of clay-like consistency in admixture with a blowing agent which yields gas formation, said lute comprising an admixture of clay or pressed colliery tailings, water, and at least one element selected from the group consisting of shale, coke breeze, or reclaimed lute, wherein the blowing agent yields gas formation in a temperature range within 140° to 240° C.
Claim 3
Dependent Claim
20 words
A lute as claimed in claim 1, wherein the amount of blowing agent is from 0.5 to 5% by weight.
Claim 4
Dependent Claim
18 words
A lute as claimed in claim 3, wherein the amount of blowing agent is about 1% by weight.
Claim 5
Dependent Claim
18 words
A lute as claimed in claim 1, wherein the water content is from 23 to 27% by weight.
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) | 1981-09-04 | 1982-03-06 | 1982-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-04 | 1986-03-06 | 1986-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-04 | 1990-03-06 | 1990-09-05 | $7700.00 | Window Closed / Lapsed |