US3524966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-generating pipe utilizing skin effect of a.c. having improved insulation in conductor line
Assignee: Individual
•
Filing: 1968-03-28
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Granted: 1970-08-18
•
Expires: 1988-03-28
Abstract
No abstract record available.
Inventors
- 👤 Masao Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:16
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/0014; F; F24; F24H; F24H1/00; F24H1/10; F24H1/101; F24H1/102; F24H1/105
Claims Analysis
Total Claims: 0
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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) | 1973-08-17 | 1974-02-16 | 1974-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-17 | 1978-02-16 | 1978-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-17 | 1982-02-16 | 1982-08-18 | $7700.00 | Window Closed / Lapsed |