Patent US2804408A successfully refreshed from Google Patents.
US2804408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of treating tin bronze
Assignee: American Brass Co
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Filing: 1953-12-29
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Granted: 1957-08-27
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Expires: 1973-12-29
Abstract
No abstract record available.
Inventors
- 👤 Hardy E Gregory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:42
CPC Classifications
C; C22; C22C; C22C9/00; C22C9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
THE METHOD OF PRODUCING A DEOXIDIZED TIN BRONZE HAVING AN ENDURANCE STRENGTH EXCEEDING 40,000 POUNDS PER SQUARE INCH AT 10,000,000 CYCLES, WHICH COMPRISES SUBJECTING A BRONZE CONTAINING 1 1/2% TO 12% TIN, 0.001% TO 0.5% RESIDUAL DEOXIDIZER, AND THE BALANCE ESSENTIALLY ALL COPPER TO COLD WORKING AND THEN ANNEALING AT A TEMPERATURE IN THE RANGE FROM 500*C.TO 600*C. FOR A SUFFICIENT PERIOD OF TIME TO EFFECT SUBSTANTIALLY COMPLETE RECRYSTALLIZATION WITHOUT INCREASING THE AVERAGE GRAINS SIZE TO ABOVE 0.045 MM., THEN SUBJECTING THE BRONZE TO SEVERE COLD WORKING SUFFICIENT TO EFFECT A REDUCTION IN CROSS-SECTIONAL AREA GREATER THAN 65%, THEN ANNEALING THE THUS-WORKED BRONZE AT A TEMPERATURE OF ABOUT 375*C. FOR A SUFFICIENT PERIOD OF TIME TO EFFECT SUBSTANTIALLY COMPLETE RECRYSTALLIZATION WITHOUT INCREASING THE AVERAGE GRAIND SIZE TO ABOVE 0.008 MM., AND THEN SUBJECTING THE THUS-ANNEALED BRONZE SUBSTANTIALLY AT ROOM TEMPERATURE TO PLASTIC DEFORMATION SUFFICIENT TO REDUCE ITS CROSS-SECTIONAL AREA BY AT LEAST 10%.
Claim 2
Independent Claim
153 words
THE METHOD OF PRODUCING A DEOXIDIZED TIN BRONZE HAVING AN ENDURANCE STRENGTH EXCEEDING 40,000 POUNDS PER SQUARE INCH AT 10,000,000 CYCLES, WHICH COMPRISES SUBJECTING A BRONZE CONTAINING 1 1/2% TO 12% TIN, 0.001% TO 0.5% RESIDUAL DEOXIDIZER, AND THE BALANCE ESSENTIALLY ALL COPPER TO COLD WORKING AND THEN ANNEALING AT A TEMPERATURE IN THE RANGE FROM 500*C.TO 600*C. FOR A SUFFICIENT PERIOD OF TIME TO EFFECT SUBSTANTIALLY COMPLETE RECRYSTALLIZATION WITHOUT INCREASING THE AVERAGE GRAINS SIZE TO ABOVE 0.045 MM., THEN SUBJECTING THE BRONZE TO SEVERE COLD WORKING SUFFICIENT TO EFFECT A REDUCTION IN CROSS-SECTIONAL AREA GREATER THAN 65%, THEN ANNEALING THE THUS-WORKED BRONZE AT A TEMPERATURE OF ABOUT 375*C. FOR A SUFFICIENT PERIOD OF TIME TO EFFECT SUBSTANTIALLY COMPLETE RECRYSTALLIZATION WITHOUT INCREASING THE AVERAGE GRAIND SIZE TO ABOVE 0.008 MM., AND THEN SUBJECTING THE THUS-ANNEALED BRONZE SUBSTANTIALLY AT ROOM TEMPERATURE TO PLASTIC DEFORMATION SUFFICIENT TO REDUCE ITS CROSS-SECTIONAL AREA BY AT LEAST 10%.
References Cited (Backward Citations)
US2676123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |