US3445620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for and method of demagnetizing
Assignee: Individual
•
Filing: 1965-05-18
•
Granted: 1969-05-20
•
Expires: 1985-05-18
Abstract
No abstract record available.
Inventors
- 👤 Arthur K Littwin
- 👤 Robert L Littwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:23
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/24; B23K11/248; H; H01; H01F; H01F13/00; H01F13/006
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) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |