US2449986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of dry contact rectifiers
Assignee: STC PLC
•
Filing: 1943-08-28
•
Granted: 1948-09-28
•
Expires: 1963-08-28
Abstract
No abstract record available.
Inventors
- 👤 Grace Bertram Barnett
- 👤 Ellison Leslie James
- 👤 Leman Hugh Spence
- 👤 Leng Charles William
- 👤 Bridge Arthur Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:49
CPC Classifications
H; H10; H10D; H10D48/00; H10D48/01; H10D48/04; H10D48/048
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1951-09-28 | 1952-03-29 | 1952-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-28 | 1956-03-29 | 1956-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-28 | 1960-03-29 | 1960-09-28 | $7700.00 | Window Closed / Lapsed |