US3572286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled heating of filaments
Assignee: Texaco Inc
•
Filing: 1967-10-09
•
Granted: 1971-03-23
•
Expires: 1987-10-09
Abstract
Abstract ELECTRICALLY CONDUCTIVE FILAMENTS ARE HEATED BY ESTABLISHING IN A SECTION OF THE FILAMENT A STANDING HALF WAVE OF HIGH FREQUENCY CURRENT BY SUBJECTING THE SECTION TO BE TREATED TO THE ACTION OF A RADIO FREQUENCY ELECTROMAGNETIC FIELD AND CONTROLLING THE DISTRIBUTION OF TEMPERATURE IN SUCH SECTION BY ADJUSTMENT OF THE PARAMETERS OF THE RADIO FREQUENCY FIELD. THE APPARATUS IS USEFUL IN THE PROVISION OF CONTROLLED TEMPERATURE PROFILES IN SELECTED SECTIONS OF A CONDUCTIVE FILAMENT.
Inventors
- 👤 Harry B Forney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:14
CPC Classifications
H; H05; H05B; H05B6/00; C; C23; C23C; C23C16/00; C23C16/44; C23C16/46; C23C16/54; C23C16/545; Y; Y10; Y10S; Y10S148/00; Y10S148/006
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |