Patent US3400252A successfully refreshed from Google Patents.
US3400252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical heating device
Assignee: Panasonic Holdings Corp
•
Filing: 1965-10-20
•
Granted: 1968-09-03
•
Expires: 1985-10-20
Abstract
No abstract record available.
Inventors
- 👤 Hayakawa Shigeru
- 👤 Iguchi Takashi
- 👤 Kasahara Yukio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:31
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/02; H01C7/022; A; A47; A47J; A47J36/00; A47J36/24; A47J36/2411; A47J36/2433; A47J36/2438; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1919; G05D23/20; G05D23/24; G05D23/2401
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3060298A
Cited
US3187164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-03 | 1972-03-04 | 1972-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-03 | 1976-03-04 | 1976-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-03 | 1980-03-04 | 1980-09-03 | $7700.00 | Window Closed / Lapsed |