US2521687A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroforming apparatus
Assignee: STC PLC
•
Filing: 1947-07-23
•
Granted: 1950-09-12
•
Expires: 1967-07-23
Abstract
No abstract record available.
Inventors
- 👤 Emmet G Cameron
- 👤 Harold A Keiper
- 👤 August D Mitschke
- 👤 Leslie G Burlingame
- 👤 Robert W Ferguson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:02
CPC Classifications
H; H10; H10D; H10D48/00; H10D48/01; H10D48/04; H10D48/048
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US830924A
Cited
GB318265A
Cited
US2239770A
Cited
US2279187A
Cited
US2368749A
Cited
US2348311A
Cited
US2390771A
Cited
US2444255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |