US2507698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hairspring
Assignee: Individual
•
Filing: 1948-01-31
•
Granted: 1950-05-16
•
Expires: 1968-01-31
Abstract
No abstract record available.
Inventors
- 👤 Dubois Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:19
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
AN ISOCHRONICALLY COMPENSATED HAIR SPRING FOR CHRONOMETERS AND THE LIKE COMPOSED OF A FERRO-NICKEL ALLOY CONTAINING FROM 0.1 TO 5% OF COLUMBIUM, FROM 29 TO 42% OF NICKEL, FROM 4 TO 10% OF CHRONIUM, FROM 1 TO 5% OF TUNGSTEN, FROM 0.5 TO 5% OF MANGANESE AND SILICON TOGETHER AND FROM 0.5 TO 1% OF CARBON, THE REMAINDER BEING IRON.
Claim 2
Dependent Claim
60 words
AN ISOCHRONICALLY COMPENSATED HAIR SPRING FOR CHRONOMETERS AND THE LIKE COMPOSED OF A FERRO-NICKEL ALLOY CONTAINING FROM 0.1 TO 5% OF COLUMBIUM, FROM 29 TO 42% OF NICKEL, FROM 4 TO 10% OF CHRONIUM, FROM 1 TO 5% OF TUNGSTEN, FROM 0.5 TO 5% OF MANGANESE AND SILICON TOGETHER AND FROM 0.5 TO 1% OF CARBON, THE REMAINDER BEING IRON.
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) | 1953-05-15 | 1953-11-14 | 1954-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-15 | 1957-11-14 | 1958-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-15 | 1961-11-14 | 1962-05-16 | $7700.00 | Window Closed / Lapsed |