US3432641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable heating device
Assignee: ROBERT J WELKE
•
Filing: 1966-03-10
•
Granted: 1969-03-11
•
Expires: 1986-03-10
Abstract
No abstract record available.
Inventors
- 👤 Robert J Welke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:20
CPC Classifications
A; A47; A47J; A47J36/00; A47J36/24; A47J36/2411; A47J36/2433
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1062344A
Cited
DE447699C
Cited
US2277605A
Cited
US2476113A
Cited
US2541218A
Cited
US2680190A
Cited
US2700097A
Cited
US2863037A
Cited
US3067373A
Cited
US3079486A
Cited
US3247360A
Cited
US3290484A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-10 | 1972-09-09 | 1973-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-10 | 1976-09-09 | 1977-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-10 | 1980-09-09 | 1981-03-11 | $7700.00 | Window Closed / Lapsed |