Patent US4891044A successfully refreshed from Google Patents.
Patent US2808494A successfully refreshed from Google Patents.
US2808494A
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Apparatus for storing and releasing heat
Assignee: Individual
•
Filing: 1952-04-22
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Granted: 1957-10-01
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Expires: 1972-04-22
Abstract
No abstract record available.
Inventors
- 👤 Telkes Maria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:50
CPC Classifications
F; F28; F28D; F28D20/00; F28D20/0056; F24; F24H; F24H7/00; F24H7/02; F24H7/04; F28D20/02; Y; Y02; Y02E; Y02E60/00; Y02E60/14; Y10; Y10S; Y10S159/00; Y10S159/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
APPARATUS FOR STORING HEAT FOR SUBSEQUENT RECOVERY THEREOF BY CRYSTAL CONVERSION OF SOLID MATERIAL, COMPRISING A MASS CONSISTING ESSENTIALY OFAN ANHYDROUS SALT SELECTED FROM THE GROUP CONSISTING OF LITHIUM SULFATE, POTASSIUM SULFATE, POTASSIUM CHROMATE, SODIUM MOLYBDATE, SODIUM TUNGSTATE AND SODIUM SULFATE IN COMBINATION WITH MEANS FOR HEATING THE SAID MASS TO A TEMPERATURE
Claim 2
Dependent Claim
53 words
APPARATUS FOR STORING HEAT FOR SUBSEQUENT RECOVERY THEREOF BY CRYSTAL CONVERSION OF SOLID MATERIAL, COMPRISING A MASS CONSISTING ESSENTIALY OFAN ANHYDROUS SALT SELECTED FROM THE GROUP CONSISTING OF LITHIUM SULFATE, POTASSIUM SULFATE, POTASSIUM CHROMATE, SODIUM MOLYBDATE, SODIUM TUNGSTATE AND SODIUM SULFATE IN COMBINATION WITH MEANS FOR HEATING THE SAID MASS TO A TEMPERATURE
References Cited (Backward Citations)
US780352A
Cited
US1069949A
Cited
US1146310A
Cited
US1379721A
Cited
US1412717A
Cited
US1971660A
Cited
US1939937A
Cited
US1887618A
Cited
US1992561A
Cited
US2124291A
Cited
US2266257A
Cited
US2338433A
Cited
US2494035A
Cited
US2572819A
Cited
US2596027A
Cited
US2602877A
Cited
US2677664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |