Patent US2688573A successfully refreshed from Google Patents.
US2688573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of heat treating magnetic iron to restore its magnetic properties
Assignee: AT&T Inc
•
Filing: 1950-11-13
•
Granted: 1954-09-07
•
Expires: 1970-11-13
Abstract
No abstract record available.
Inventors
- 👤 Jonathan S Lee
- 👤 Elarde Paulf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:26
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0206
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A METHOD OF TREATING AN IRON CORE OF AN ELECTRO-MAGNETIC RELAY WHICH HAS LOST SOME OF ITS MAGNETIC PROPERTIES DUE TO AGING TO RESTORE THE MAGNETIC PROPERTIES THEREOF TO THAT OF THE CORE BEFORE AGING WITHOUT REMOVING THE CORE FROM THE RELAY, WHICH METHOD CONSIST OF CONNECTING THE MAGNETIC IRON CORE TO AN ELECTRIC CIRCUIT AND PASSING A RELATIVELY HIGH CURRENT THERETHROUGH TO
Claim 2
Independent Claim
63 words
A METHOD OF TREATING AN IRON CORE OF AN ELECTRO-MAGNETIC RELAY WHICH HAS LOST SOME OF ITS MAGNETIC PROPERTIES DUE TO AGING TO RESTORE THE MAGNETIC PROPERTIES THEREOF TO THAT OF THE CORE BEFORE AGING WITHOUT REMOVING THE CORE FROM THE RELAY, WHICH METHOD CONSIST OF CONNECTING THE MAGNETIC IRON CORE TO AN ELECTRIC CIRCUIT AND PASSING A RELATIVELY HIGH CURRENT THERETHROUGH TO
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) | 1957-09-06 | 1958-03-08 | 1958-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-06 | 1962-03-08 | 1962-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-06 | 1966-03-08 | 1966-09-07 | $7700.00 | Window Closed / Lapsed |