US3171387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined room heating and warm water preparing apparatus
Assignee: Individual
•
Filing: 1957-02-26
•
Granted: 1965-03-02
•
Expires: 1977-02-26
Abstract
No abstract record available.
Inventors
- 👤 Muller Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:21
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/48; F24H1/52; F24H1/526
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN A COMBINED HOT WATER SUPPLY AND SPACE HEATING SYSTEM, FIRST AND SECOND COAXIALLY ARRANGED RADIALLYSPACED INNER AND OUTER TUBE SECTIONS HAVING CONNECTION AT THEIR FIRST CONTIGUOUS ENDS WITH A COMMON SOURCE OF WATER SUPPLY, A FIRST HEADER AT THE SECOND END OF SAID OUTER TUBE SECTION CONNECTING THE SAME WITH SPACE HEATING MEANS, A SECOND HEADER CONNECTED WITH THE SECOND END OF SAID INNER TUBE SECTION AND FROM WHICH HOT WATER IS DRAWN FOR HOUSEHOLD USE, AND A CONNECTION TO THE FIRST END OF SAID SECOND TUBE FOR THE RETURN THERETO OF WATER FROM SAID SPACE HEATING MEANS AND THE RECIRCULA-
Claim 2
Dependent Claim
102 words
IN A COMBINED HOT WATER SUPPLY AND SPACE HEATING SYSTEM, FIRST AND SECOND COAXIALLY ARRANGED RADIALLYSPACED INNER AND OUTER TUBE SECTIONS HAVING CONNECTION AT THEIR FIRST CONTIGUOUS ENDS WITH A COMMON SOURCE OF WATER SUPPLY, A FIRST HEADER AT THE SECOND END OF SAID OUTER TUBE SECTION CONNECTING THE SAME WITH SPACE HEATING MEANS, A SECOND HEADER CONNECTED WITH THE SECOND END OF SAID INNER TUBE SECTION AND FROM WHICH HOT WATER IS DRAWN FOR HOUSEHOLD USE, AND A CONNECTION TO THE FIRST END OF SAID SECOND TUBE FOR THE RETURN THERETO OF WATER FROM SAID SPACE HEATING MEANS AND THE RECIRCULA-
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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) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |