Patent US3019516A successfully refreshed from Google Patents.
Patent US3506509A successfully refreshed from Google Patents.
US3506509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etchant for precision etching of semiconductors
Assignee: AT&T Inc
•
Filing: 1967-11-01
•
Granted: 1970-04-14
•
Expires: 1987-11-01
Abstract
No abstract record available.
Inventors
- 👤 Roger C Kragness
- 👤 Herbert A Waggener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:03
CPC Classifications
H; H10; H10P; H10P50/00; H10P50/69; H10P50/691; H10P50/693; H10P50/60; H10P50/64; H10P50/642; H10P50/644; H10P95/00; Y; Y10; Y10S; Y10S148/00; Y10S148/051; Y10S148/115
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) | 1973-04-13 | 1973-10-13 | 1974-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-13 | 1977-10-13 | 1978-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-13 | 1981-10-13 | 1982-04-14 | $7700.00 | Window Closed / Lapsed |