US3245812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaped refractory heat exchange bodies and process for making same
Assignee: Oil Shale Corp
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Filing: 1962-07-19
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Granted: 1966-04-12
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Expires: 1982-07-19
Abstract
No abstract record available.
Inventors
- 👤 Hobaugh John
- 👤 Otto Henry
- 👤 Padilla Victor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:12
CPC Classifications
C; C04; C04B; C04B32/00; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A FIRED SOLID SHAPTED REFRACTORY BODY SUITABLE FOR USE AS A HEAT EXCHANGE MEANS AND CHARACTERIZED BY HIGH RESISTANCE TO MECHANICAL AND THERMAL STRESS, HIGH RESISTANCE TO ABRASION, LOW POROSITY, FINE CRYSTALE GRAIN SIZE, AND SUBSTANTIAL INFORMITY OF GRAIN SIZE AND STURCTURE THROUGHOUT ITS MASS, WHICH BODY CONSISTS ESSENTIALLY OF OIL SHALE ASH INITIALLY GROUND TO A FINENESS SUCH THAT AT LEAST 5% OF THE PARTICLES PASS A 200 MESH TYLER SCREEN.
Claim 2
Dependent Claim
72 words
A FIRED SOLID SHAPTED REFRACTORY BODY SUITABLE FOR USE AS A HEAT EXCHANGE MEANS AND CHARACTERIZED BY HIGH RESISTANCE TO MECHANICAL AND THERMAL STRESS, HIGH RESISTANCE TO ABRASION, LOW POROSITY, FINE CRYSTALE GRAIN SIZE, AND SUBSTANTIAL INFORMITY OF GRAIN SIZE AND STURCTURE THROUGHOUT ITS MASS, WHICH BODY CONSISTS ESSENTIALLY OF OIL SHALE ASH INITIALLY GROUND TO A FINENESS SUCH THAT AT LEAST 5% OF THE PARTICLES PASS A 200 MESH TYLER SCREEN.
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) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |