US2953247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of electrical contacts
Assignee: Johnson Matthey PLC
•
Filing: 1955-05-12
•
Granted: 1960-09-20
•
Expires: 1975-05-12
Abstract
No abstract record available.
Inventors
- 👤 Walter Derek Oscar
- 👤 Tucker Norman Albert
- 👤 Ronald William Ing Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:17
CPC Classifications
B; B21; B21K; B21K1/00; B21K1/58; B21K1/62; B21C; B21C23/00; B21C23/02; B21C23/03; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49204; Y10T29/49208; Y10T29/49218; Y10T29/49826; Y10T29/49908; Y10T29/49915; Y10T29/49938
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |