US3411902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing infiltrated contact material
Assignee: Duracell Inc USA
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Filing: 1968-01-22
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Granted: 1968-11-19
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Expires: 1988-01-22
Abstract
No abstract record available.
Inventors
- 👤 Richard H Krock
- 👤 Edward J Zdanuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:49
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/0203; C; C22; C22C; C22C1/00; C22C1/04; C22C1/0475
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |