Patent US4256503A successfully refreshed from Google Patents.
US4256503A
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Method for effectively utilizing waste tires
Assignee: Bridgestone Corp
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Filing: 1979-10-17
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Granted: 1981-03-17
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Expires: 1999-10-17
Abstract
Abstract Waste tires are used in production of cement using a rotary kiln for saving the use of fuel by feeding waste tires as such or crushed waste tire pieces to the position where the temperature of the exhaust gas in this apparatus is 600 DEG -1,400 DEG C. in an amount of not more than 60% of the total used fuel calculated as heat energy.
Inventors
- 👤 Akikazu Tsuda
- 👤 Motokazu Kikuchi
- 👤 Tadatoshi Shimazaki
- 👤 Toshio Tsuji
- 👤 Shunro Ueda
- 👤 Masamichi Kabaya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:00
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/36; C04B7/43; C04B7/44; C04B7/4407; C04B7/4423; C04B7/443; F; F23; F23G; F23G5/00; F23G5/44; F23G5/46; Y; Y02; Y02E; Y02E50/00; Y02E50/30; Y02P; Y02P40/00; Y02P40/10; Y02P40/125
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
69 words
A method for effectively utilizing waste tires in an apparatus for burning cement by means of a rotary kiln, comprising the steps of; charging waste tires directly without crushing or crushed waste tire pieces as fuel to a position in said kiln where the gas temperature in this apparatus is 600°-1,400° C., said charging in an amount not exceeding 60% of the total fuel use calculated as heat energy.
Claim 2
Independent Claim
69 words
A method for effectively utilizing waste tires in an apparatus for burning cement by means of a rotary kiln, comprising the steps of; charging waste tires directly without crushing or crushed waste tire pieces as fuel to a position in said kiln where the gas temperature in this apparatus is 600°-1,400° C., said charging in an amount not exceeding 60% of the total fuel use calculated as heat energy.
Claim 3
Dependent Claim
33 words
The method as claimed in claim 1, wherein the amount of the waste tires or crushed waste tire pieces is not more than 15% of the total fuel use calculated as heat energy.
Claim 4
Dependent Claim
23 words
The method as claimed in claim 1, wherein said amount of charging is 5-10% of the total fuel use calculated as heat energy.
References Cited (Backward Citations)
US4081285A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |