US3438753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tungsten-copper composites
Assignee: Duracell Inc USA
•
Filing: 1967-05-01
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Granted: 1969-04-15
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Expires: 1987-05-01
Abstract
No abstract record available.
Inventors
- 👤 James C Kenney
- 👤 J Richard Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:49
CPC Classifications
C; C22; C22C; C22C27/00; C22C27/04; B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/20; C22C9/00; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/929; Y10S75/00; Y10S75/95; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/1216; Y10T428/12174
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3125441A
Cited
US1751780A
Cited
US2179960A
Cited
US2669008A
Cited
US2983996A
Cited
US3145529A
Cited
US3338687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |