US4806309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tin base lead-free solder composition containing bismuth, silver and antimony
Assignee: WILLARD SOLDERS Inc
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Filing: 1988-01-05
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Granted: 1989-02-21
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Expires: 2008-01-05
Abstract
Abstract A lead-free solder composition of approximately 90% to 95% by weight tin, approximately 3% to 5% by weight antimony, approximately 1% to 4.5% by weight bismuth, and approximately 0.1% to 0.5% by weight silver.
Inventors
- 👤 Stanley Tulman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:17
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/26; B23K35/262; C; C22; C22C; C22C13/00; C22C13/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
26 words
A lead-free solder composition consisting essentially of tin, antimony, bismuth and silver, wherein the percentage weight proportions are: Tin--Approximately 90-95%, Antimony--Approximately 3-5%, Bismuth--Appoximately 1-4.5%, Silver--Approximately 0.1-0.5%.
Claim 2
Dependent Claim
26 words
A lead-free solder composition consisting essentially of tin, antimony, bismuth and silver, wherein the percentage weight proportions are: Tin--Approximately 90-95%, Antimony--Approximately 3-5%, Bismuth--Appoximately 1-4.5%, Silver--Approximately 0.1-0.5%.
Claim 3
Dependent Claim
23 words
A lead-free solder composition according to claim 1 and wherein the percentage weight proportions are: Tin--Approximately 95%, Antimony--Approximately 3%, Bismuth--Approximately 1.5%, Silver--Approximately 0.5%.
Claim 4
Dependent Claim
23 words
A lead-free solder composition according to claim 1 and wherein the percentage weight proportions are: Tin--Approximately 90%, Antimony--Approximately 5%, Bismuth--Approximately 4.5%, Silver--Approximately 0.5%.
References Cited (Backward Citations)
US3607253A
Cited
US4670217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |