US2820420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal working apparatus
Assignee: Hayes Track Appliance Co
•
Filing: 1953-07-24
•
Granted: 1958-01-21
•
Expires: 1973-07-24
Abstract
No abstract record available.
Inventors
- 👤 Stanley W Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:11
CPC Classifications
B; B23; B23K; B23K7/00; B23K7/10; B23K7/105; F; F16; F16H; F16H7/00; F16H7/08; F16H2007/0889; F16H2007/0891
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |