US3474229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating element for electric cable furnaces for heating a flow of gas or liquid
Assignee: Individual
•
Filing: 1967-06-28
•
Granted: 1969-10-21
•
Expires: 1987-06-28
Abstract
No abstract record available.
Inventors
- 👤 Leif Rump
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:13
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0405
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2941123A
Cited
US3038057A
Cited
US3056846A
Cited
US3065436A
Cited
US3032635A
Cited
US3265865A
Cited
US3371192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |