Patent US2566615A successfully refreshed from Google Patents.
US2566615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etching tungsten coils
Assignee: GTE Sylvania Inc
•
Filing: 1947-03-21
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Granted: 1951-09-04
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Expires: 1967-03-21
Abstract
No abstract record available.
Inventors
- 👤 Gerald W Keilholtz
- 👤 Martha J Bergin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:09
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/32; C23F1/38; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49995
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
THE PROCESS OF REDUCING THE DIAMETER OF COILED TUNGSTEN WIRE WHICH COMPRISES BATHING THE COILED TUNGSTEN WIRE IN AN AGITATED SOLUTION OF ALKALINE POTASSIUM FERRICYANIDE.
Claim 2
Dependent Claim
25 words
THE PROCESS OF REDUCING THE DIAMETER OF COILED TUNGSTEN WIRE WHICH COMPRISES BATHING THE COILED TUNGSTEN WIRE IN AN AGITATED SOLUTION OF ALKALINE POTASSIUM FERRICYANIDE.
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) | 1954-09-03 | 1955-03-05 | 1955-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-03 | 1959-03-05 | 1959-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-03 | 1963-03-05 | 1963-09-04 | $7700.00 | Window Closed / Lapsed |