US3788912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System suitable for controlling etching without the aid of an etchant resistant
Assignee: Buckbee Mears Co
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Filing: 1971-11-10
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Granted: 1974-01-29
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Expires: 1991-11-10
Abstract
Abstract AN ETCHING SYSTEM HAVING SETS OF PREARRANGED NOZZLES FOR DISPENSING ETCHANT ONTO PREFORMED MASKS IN A PREDETERMINED PATTERN TO ALLOW AN OPERATOR TO CONTROLLABLY ENLARGE THE APERTURES IN A PREFORMED MASK WITHOUT THE AID OF AN ETCHANT RESIST.
Inventors
- 👤 J Frantzen
- 👤 N Paul
- 👤 C Lund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:58
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/02; C23F1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |