US2644799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-exchange pebbles
Assignee: Phillips Petroleum Co
•
Filing: 1949-05-05
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Granted: 1953-07-07
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Expires: 1969-05-05
Abstract
No abstract record available.
Inventors
- 👤 Sam P Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:03
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/45; C04B41/4584; B; B01; B01J; B01J8/00; B01J8/08; B01J8/087; C04B38/00; C04B38/009; C04B41/009; F; F28; F28C; F28C3/00; F28C3/10; F28C3/12; F28C3/14; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00327; B01J2208/00336; B01J2208/0038; B01J2208/0053; Y; Y10; Y10S; Y10S425/00; Y10S425/101
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
143 words
A PROCESS FOR MANUFACTURING 3/16" TO 1" PEBBLES OF IMPROVED RESISTANCE TO THERMAL AND MECHANICAL SHOCK AND TO ABRASION IN GRAVITATINGBED HEAT-EXCHANGE PROCESSES, WHICH COMPRISES COMPACTING A PEBBLE CORE OF A DIAMETER IN THE RANGE OF 1/4 TO 9/10 OF THE DIAMETER OF THE PEBBLE FROM 50 TO 150 MESH ALUMINA AND A VOLATILE BINDER; ENCASING SAID CORE WITH A COMPACT LAYER CONSISTING ESSENTIALLY OF A VOLATILE BINDER AND AT LEAST 325 MESH MATERIAL SELECTED FROM THE CLASS CONSISTING OF ALUMINA, ALUMINA-SILICA, AND ALUMINA-ALUMINUM SILICATE TO FORM THE BALANCE OF THE PEBBLE; AND CALCINING THE PEBBLE AT A TEMPERATURE IN THE RANGE OF 2900* TO 3200* F. FOR AT LEAST 2 HOURS AND UNTIL THE POROSITY LIES IN THE RANGE OF 5 TO 20 PER CENT SO AS TO FORM A FIRM BOND IN THE PEBBLE AND FIX THE SHELL TO THE CORE.
Claim 2
Dependent Claim
143 words
A PROCESS FOR MANUFACTURING 3/16" TO 1" PEBBLES OF IMPROVED RESISTANCE TO THERMAL AND MECHANICAL SHOCK AND TO ABRASION IN GRAVITATINGBED HEAT-EXCHANGE PROCESSES, WHICH COMPRISES COMPACTING A PEBBLE CORE OF A DIAMETER IN THE RANGE OF 1/4 TO 9/10 OF THE DIAMETER OF THE PEBBLE FROM 50 TO 150 MESH ALUMINA AND A VOLATILE BINDER; ENCASING SAID CORE WITH A COMPACT LAYER CONSISTING ESSENTIALLY OF A VOLATILE BINDER AND AT LEAST 325 MESH MATERIAL SELECTED FROM THE CLASS CONSISTING OF ALUMINA, ALUMINA-SILICA, AND ALUMINA-ALUMINUM SILICATE TO FORM THE BALANCE OF THE PEBBLE; AND CALCINING THE PEBBLE AT A TEMPERATURE IN THE RANGE OF 2900* TO 3200* F. FOR AT LEAST 2 HOURS AND UNTIL THE POROSITY LIES IN THE RANGE OF 5 TO 20 PER CENT SO AS TO FORM A FIRM BOND IN THE PEBBLE AND FIX THE SHELL TO THE CORE.
Claim 3
Dependent Claim
98 words
A HEAT-BONDED SPHERICAL 3/16" TO 1" PEBBLE HAVING A COMPACT DENSE CORE FORMED OF 50 TO 150 MESH ALPHA CORUNDUM GRAINS ENCASED IN A COMPACT, GLAZED SHELL CONSISTING ESSENTIALLY OF A MATERIAL SELECTED FROM THE CLASS CONSISTING OF ALUMINA, MULLITE, AND ALUMINA-MULLITE, SAID SHELL HAVING BEEN FORMED BY CALCINING PARTICLES OF AT LEAST 325 MESH FINENESS OF MATERIAL SELECTED FROM THE CLASS CONSISTING OF ALUMINA, ALUMINA-SILICA, AND ALUMINA-ALUMINUM SILICATE, SAID PEBBLES HAVING A POROSITY IN THE RANGE OF 5 TO 20 PER CENT, THE OUTER CRYSTALS IN SAID CORE BEING HEAT-BONDED TO THE INNER CRYSTALS OF SAID SHELL.
Claim 4
Dependent Claim
98 words
A HEAT-BONDED SPHERICAL 3/16" TO 1" PEBBLE HAVING A COMPACT DENSE CORE FORMED OF 50 TO 150 MESH ALPHA CORUNDUM GRAINS ENCASED IN A COMPACT, GLAZED SHELL CONSISTING ESSENTIALLY OF A MATERIAL SELECTED FROM THE CLASS CONSISTING OF ALUMINA, MULLITE, AND ALUMINA-MULLITE, SAID SHELL HAVING BEEN FORMED BY CALCINING PARTICLES OF AT LEAST 325 MESH FINENESS OF MATERIAL SELECTED FROM THE CLASS CONSISTING OF ALUMINA, ALUMINA-SILICA, AND ALUMINA-ALUMINUM SILICATE, SAID PEBBLES HAVING A POROSITY IN THE RANGE OF 5 TO 20 PER CENT, THE OUTER CRYSTALS IN SAID CORE BEING HEAT-BONDED TO THE INNER CRYSTALS OF SAID SHELL.
References Cited (Backward Citations)
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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) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |