US3488475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Baseboard electric heating apparatus
Assignee: Individual
•
Filing: 1966-10-25
•
Granted: 1970-01-06
•
Expires: 1986-10-25
Abstract
No abstract record available.
Inventors
- 👤 Walter Gronwoldt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:20
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/002; F24D; F24D19/00; F24D19/06; H; H05; H05B; H05B3/00; H05B3/40; H05B3/42; H05B3/48; H05B3/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1432064A
Cited
US2063642A
Cited
US2815431A
Cited
FR1328725A
Cited
US3266563A
Cited
US3340382A
Cited
US3371192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |