US3928085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Timepiece mainspring of cobalt-nickel base alloys having high elasticity and high proportional limit
Assignee: Suwa Seikosha KK
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Filing: 1974-06-10
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Granted: 1975-12-23
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Expires: 1994-06-10
Abstract
Abstract Timepiece mainsprings of cobalt-nickel base alloys containing chromium within a narrow range retain their high corrosion resistance, high elasticity, high proportional limit and substantial extensibility for long periods and through many cycles of winding and unwinding.
Inventors
- 👤 Katsumi Yamamura
- 👤 Hiroshi Harigaya
- 👤 Yasuo Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:54
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/07; G; G04; G04B; G04B1/00; G04B1/10; G04B1/14; G04B1/145
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
131 words
A mainspring for a timepiece composed of an alloy consisting essentially of 30-50% Co, 25-35% Ni, at least one member selected from the group consisting of Cr in the range of 6-9 percent, Mo in the range of 8-12 percent, and W in the range of 2-9 percent, the total weight of Cr, Mo and W being in the range of 15-30 percent, at least one member selected from the group consisting of Ti in the range 0.05-5 percent, Nb in the range 0.1-6 percent and Be in the range 0.01-3 percent, less that 2% Mn, less than 1.5% Si and less than 5% Fe, said alloy having been quenched for 10-90 minutes from 1,100*-1,200*C, hot-forged, hot-rolled and cold-worked to reduce the cross-section of said alloy by at least 80 percent.
Claim 2
Dependent Claim
131 words
A mainspring for a timepiece composed of an alloy consisting essentially of 30-50% Co, 25-35% Ni, at least one member selected from the group consisting of Cr in the range of 6-9 percent, Mo in the range of 8-12 percent, and W in the range of 2-9 percent, the total weight of Cr, Mo and W being in the range of 15-30 percent, at least one member selected from the group consisting of Ti in the range 0.05-5 percent, Nb in the range 0.1-6 percent and Be in the range 0.01-3 percent, less that 2% Mn, less than 1.5% Si and less than 5% Fe, said alloy having been quenched for 10-90 minutes from 1,100*-1,200*C, hot-forged, hot-rolled and cold-worked to reduce the cross-section of said alloy by at least 80 percent.
Claim 3
Dependent Claim
17 words
A mainspring as defined in claim 1 wherein the W content is in the range 2-6 percent.
Claim 4
Dependent Claim
19 words
The mainspring as defined in claim 1 wherein said alloy has been age-hardened for 1-5 hours at 400*- 600*C.
Claim 5
Dependent Claim
18 words
The mainspring as defined in claim 2 wherein said mainspring has been age-hardened for 2.5-3.5 hours at 400*-600*C.
Claim 6
Dependent Claim
18 words
The mainspring as defined in claim 2 wherein said mainspring has been age-hardened for 3 hours at 400*-600*C.
Claim 7
Dependent Claim
149 words
THE PROCESS OF MANUFACTURING A MAINSPRING FOR A TIMEPIECE, COMPRISING THE STEPS OF FORMING AN ALLOY BY MELTING IN VACUUM AT A TEMPERATURE BETWEEN 1,400*C AND 1,600*C A COMPOSITION CONSISTING ESSENTIALLY OF 30-50% CO, 25-35% NI, AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF CR IN THE RANGE OF 6-9 PERCENT, MO IN THE RANGE OF 8-12 PERCENT, AND W IN THE RANGE OF 2-9 PERCENT, THE TOTAL WEIGHT OF CR, MO AND W BEING IN THE RANGE OF 15-30 PERCENT, AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF TI IN THE RANGE 0.05-5 PERCENT, NB IN THE RANGE 0.1-6 PERCENT AND BE IN THE RANGE 0.01-3 PERCENT, LESS THAN 2% MN, LESS THAN 1.5% SI AND LESS THAN 5% FE, QUENCHING SAID ALLOY FOR 10-90 MINUTES FROM 1,100*-1,200*C HOT-FORGING, HOT-ROLLING AND COLD-PROCESSING SAID ALLOY TO REDUCE THE CROSS-SECTIONAL AREA BY AT LEAST 80 PERCENT.
Claim 8
Dependent Claim
149 words
THE PROCESS OF MANUFACTURING A MAINSPRING FOR A TIMEPIECE, COMPRISING THE STEPS OF FORMING AN ALLOY BY MELTING IN VACUUM AT A TEMPERATURE BETWEEN 1,400*C AND 1,600*C A COMPOSITION CONSISTING ESSENTIALLY OF 30-50% CO, 25-35% NI, AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF CR IN THE RANGE OF 6-9 PERCENT, MO IN THE RANGE OF 8-12 PERCENT, AND W IN THE RANGE OF 2-9 PERCENT, THE TOTAL WEIGHT OF CR, MO AND W BEING IN THE RANGE OF 15-30 PERCENT, AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF TI IN THE RANGE 0.05-5 PERCENT, NB IN THE RANGE 0.1-6 PERCENT AND BE IN THE RANGE 0.01-3 PERCENT, LESS THAN 2% MN, LESS THAN 1.5% SI AND LESS THAN 5% FE, QUENCHING SAID ALLOY FOR 10-90 MINUTES FROM 1,100*-1,200*C HOT-FORGING, HOT-ROLLING AND COLD-PROCESSING SAID ALLOY TO REDUCE THE CROSS-SECTIONAL AREA BY AT LEAST 80 PERCENT.
Claim 9
Dependent Claim
20 words
The process as defined in claim 6, wherein the W content of said alloy is in the range 2-6 percent.
Claim 10
Dependent Claim
20 words
The process as defined in claim 6, further comprising the step of age-hardening said alloy for 1-5 hours at 400*-600*C.
Claim 11
Dependent Claim
17 words
The process as defined in claim 6, wherein said alloy is age-hardened for 2.5-3.5 hours at 400*-600*C.
Claim 12
Dependent Claim
17 words
The process as defined in claim 6 wherein said alloy is age-hardened for 3 hours at 400*-600*C.
References Cited (Backward Citations)
US2859149A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |