Patent US2884615A successfully refreshed from Google Patents.
Patent US4166111A successfully refreshed from Google Patents.
Patent US4455883A successfully refreshed from Google Patents.
Patent US2256642A successfully refreshed from Google Patents.
US2256642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric resistance element
Assignee: Duracell Inc USA
•
Filing: 1939-03-09
•
Granted: 1941-09-23
•
Expires: 1959-03-09
Abstract
No abstract record available.
Inventors
- 👤 Gaut Geoffrey Charles
- 👤 Huggins Benjamin Frederick
- 👤 Swaddle Donald
- 👤 Stubbs Harold Vivien George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:00
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31703
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-09-22 | 1945-03-24 | 1945-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-09-22 | 1949-03-24 | 1949-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-09-22 | 1953-03-24 | 1953-09-23 | $7700.00 | Window Closed / Lapsed |