US4452757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper alloy for radiators
Assignee: Nihon Kogyo KK
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Filing: 1982-11-09
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Granted: 1984-06-05
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Expires: 2002-11-09
Abstract
Abstract Corrosion-resistant copper alloys for the manufacture of radiators are composed of, by weight, 25-40% zinc, 0.005-0.070% phosphorus, 0.05-1.0% each tin and aluminum, and the balance copper and inevitable impurities.
Inventors
- 👤 Susumu Kawauchi
- 👤 Junji Honda
- 👤 Kiyoaki Nishikawa
- 👤 Masahiro Tsuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:08
CPC Classifications
C; C22; C22C; C22C9/00; C22C9/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
28 words
A copper alloy suited for the manufacture of radiators consisting essentially of: 25-40 wt %--zinc, 0.005-0.070 wt %--phosphorus, 0.05-1.0 wt %--tin, 0.05-1.0 wt %--aluminum, balance--copper and concomitant impurities.
Claim 2
Dependent Claim
28 words
A copper alloy suited for the manufacture of radiators consisting essentially of: 25-40 wt %--zinc, 0.005-0.070 wt %--phosphorus, 0.05-1.0 wt %--tin, 0.05-1.0 wt %--aluminum, balance--copper and concomitant impurities.
Claim 3
Dependent Claim
30 words
A copper alloy as described in claim 1 wherein the alloy consists essentially of: 27-37 wt %--zinc, 0.01-0.04 wt %--phosphorus, 0.1-0.5 wt %--tin, 0.1-0.5 wt %--aluminum, balance--copper and concomitant impurities.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |