US3339629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ground storage means for structure heating and cooling systems
Assignee: IND INSTITUTION INTERNATIONAL
•
Filing: 1966-05-24
•
Granted: 1967-09-05
•
Expires: 1986-05-24
Abstract
No abstract record available.
Inventors
- 👤 David E Hervey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:13
CPC Classifications
F; F28; F28D; F28D20/00; F28D20/0052; F24; F24F; F24F5/00; F24F5/0046; Y; Y02; Y02E; Y02E60/00; Y02E60/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
57 words
IN A HEATING SYSTEM FOR A STRUCTURE HAVING WALLS AND INCORPORATING THE STORAGE OF HEAT OBTAINED FROM FIRST NATURAL SOURCES IN A DEFINED BLOCK OF GENERALLY UNDISTURBED EARTH SURROUNDED ON ITS VERTICAL PERIMETER BY A DEFINED STORAGE AREA OF LESSER TEMPERATURE CONCENTRATION OBTAINED FROM SECOND NATURAL SOURCES; THE IMPROVEMENT COMPRISING A TEMPERATURE CONDUCTING MEDIA; MEANS FOR TRANSFERRING
References Cited (Backward Citations)
US2007406A
Cited
US2396338A
Cited
US2428876A
Cited
US2689090A
Cited
US2581744A
Cited
US2780415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-04 | 1971-03-06 | 1971-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-04 | 1975-03-06 | 1975-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-04 | 1979-03-06 | 1979-09-05 | $7700.00 | Window Closed / Lapsed |