US2530841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for indicating variations in thread tension in sewing machines
Assignee: Individual
•
Filing: 1947-10-31
•
Granted: 1950-11-21
•
Expires: 1967-10-31
Abstract
No abstract record available.
Inventors
- 👤 Roseman Leo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:19
CPC Classifications
D; D05; D05B; D05B63/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1455387A
Cited
US1569074A
Cited
US2200720A
Cited
US2254606A
Cited
US2364515A
Cited
US2387369A
Cited
US2387958A
Cited
US2407342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |