Patent US4383650A successfully refreshed from Google Patents.
Patent US4444156A successfully refreshed from Google Patents.
US4444156A
Expired / Lapsed
US
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Water heater
Assignee: YOUEI SEISAKUSHO KK
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Filing: 1982-12-09
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Granted: 1984-04-24
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Expires: 2002-12-09
Abstract
Abstract A water heater of the combustion type having a collecting assembly for collecting the drain water resulting from combustion to prevent corrosion of components of the heater by the drain water.
Inventors
- 👤 Yasutaka Iwasaki
- 👤 Mitsuru Tanaka
- 👤 Akihiko Yasuda
- 👤 Munetaka Kinugasa
- 👤 Toshihiko Kikuchi
- 👤 Masao Maruyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:28
CPC Classifications
F; F24; F24H; F24H8/00; F24H8/006; F24H1/00; F24H1/10; F24H1/12; F24H1/14; F24H1/145; Y; Y02; Y02B; Y02B30/00; Y10; Y10S; Y10S165/00; Y10S165/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A water heater comprising: a heat exchanger through which water is passed; a burner for generating hot combustion gases; means for directing the hot gases over said exchanger to heat the water therein whereby acidic condensate is formed on said exchanger; means for collecting the acidic condensate on said exchanger; and drain means connected to said collecting means; characterized in that: an acid neutralizing unit is connected into said drain means and comprises a box-shaped case having therein drain channel means, including a plurality of downwardly inclined drain courses series connected in zigzag form with a gentle slope for each course, the lower surface of each of said courses being provided with a plurality of arc-like recesses with the axes thereof extending transversely of the corresponding course, said box-shaped case being formed of plastic material and including a cover of transparent material forming a side wall of each of said courses, and a solid piece of acid-neutralizing magnesium in each of said recesses.
Claim 2
Dependent Claim
163 words
A water heater comprising: a heat exchanger through which water is passed; a burner for generating hot combustion gases; means for directing the hot gases over said exchanger to heat the water therein whereby acidic condensate is formed on said exchanger; means for collecting the acidic condensate on said exchanger; and drain means connected to said collecting means; characterized in that: an acid neutralizing unit is connected into said drain means and comprises a box-shaped case having therein drain channel means, including a plurality of downwardly inclined drain courses series connected in zigzag form with a gentle slope for each course, the lower surface of each of said courses being provided with a plurality of arc-like recesses with the axes thereof extending transversely of the corresponding course, said box-shaped case being formed of plastic material and including a cover of transparent material forming a side wall of each of said courses, and a solid piece of acid-neutralizing magnesium in each of said recesses.
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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) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |