US3554441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement in central heating systems
Assignee: Individual
•
Filing: 1968-12-09
•
Granted: 1971-01-12
•
Expires: 1988-12-09
Abstract
Abstract A central heating system comprises a vessel placed on a level above the heating circuit. Said vessel has an overflow pipe belonging to a circulating circuit by means of which liquid is continuously fed to the vessel from a lower container to maintain a constant level in the vessel. The lower container communicates with the atmosphere, the volume changes in the heating circuit being taken up in said container.
Inventors
- 👤 Karl Gunnar Malmstrom
- 👤 Roy Henning Donald Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:54
CPC Classifications
F; F24; F24D; F24D3/00; F24D3/10; F24D3/1008; F24D3/1041
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
63 words
In a central heating system having a heating circuit, and a vessel disposed on a level above the heating circuit; the improvement comprising a container separate from the heating circuit and disposed at a level below the vessel, means for continuously feeding liquid from said container to said vessel, and constant level overflow means for returning liquid from said vessel to said container.
Claim 2
Dependent Claim
63 words
In a central heating system having a heating circuit, and a vessel disposed on a level above the heating circuit; the improvement comprising a container separate from the heating circuit and disposed at a level below the vessel, means for continuously feeding liquid from said container to said vessel, and constant level overflow means for returning liquid from said vessel to said container.
Claim 3
Dependent Claim
13 words
A system as claimed in claim 1, said container communicating with the atmosphere.
Claim 4
Dependent Claim
40 words
A system as claimed in claim 2, and a liquid level regulator for said container, and means responsive to said regulator for adding liquid to said container when the level of liquid in the container falls below a predetermined height.
Claim 5
Dependent Claim
34 words
A system as claimed in claim 1, the inlet of liquid from said container into said vessel being at a higher level than the inlet of liquid from the heating circuit into said vessel.
Claim 6
Dependent Claim
51 words
A system as claimed in claim 1, and a partition wall that subdivides said vessel and that extends below the liquid level in the vessel, said vessel communicating with the atmosphere on the side of said partition wall which is opposite the side on which said container communicates with the vessel.
Claim 7
Dependent Claim
22 words
A system as claimed in claim 1, said overflow means communicating with said container below the level of liquid in said container.
References Cited (Backward Citations)
US352908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |