US3307009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic heating unit
Assignee: Individual
•
Filing: 1965-10-21
•
Granted: 1967-02-28
•
Expires: 1985-10-21
Abstract
No abstract record available.
Inventors
- 👤 Charles F Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:42
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/105; H05B6/108; H05B6/06; H05B6/062; H05B2206/00; H05B2206/02; H05B2206/024
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
104 words
AN ELECTRICAL HEATER UNIT PROVIDING HEAT TO A CHAMBER SPACE CONTAINED THEREIN COMPRISING A MAGNETIC CORE FORMING A MAGNETIC LOOP, A PRIMARY CIRCUIT WOUND ON SAID CORE, AND A SINGLE TURN SECONDARY CIRCUIT CLOSED ON ITSELF ABOUT THE CROSS-SECTION OF SAID CORE AS WELL AS SAID PRIMARY CIRCUIT, SAID SECONDARY CIRCUIT EXTENDING OVER THE FULL LENGTH OF SAID MAGNETIC CORE LOOP AND PRIMARY CIRCUIT AND BACK TO ITSELF TO FORM AN ENCLOSURE FOR SAID MAGNETIC LOOP AND PRIMARY CIRCUIT, SAID SINGLE TURN SECONDARY CIRCUIT ALSO FORMING A WALL PORTION OF SAID CHAMBER AND PROVIDING A SOURCE OF HEAT FOR THE INTERIOR OF SAID CHAMBER.
References Cited (Backward Citations)
US607093A
Cited
US2381866A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |