US3542550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive glass technique for forming contact holes in protective glass layers
Assignee: International Business Machines Corp
•
Filing: 1966-09-30
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Granted: 1970-11-24
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Expires: 1986-09-30
Abstract
No abstract record available.
Inventors
- 👤 Ernest E Conrad
- 👤 Ronald P Esch
- 👤 Robert L Hallen
- 👤 Richard A Leonard
- 👤 William A Pliskin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:57
CPC Classifications
H; H10; H10W; H10W74/00; H10W74/10; H10W74/131; H10P; H10P95/00; H10W20/00; H10W20/40; H10W74/40; H10W74/43; Y; Y10; Y10S; Y10S438/00; Y10S438/942; Y10S438/948; Y10S438/95
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3355291A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-23 | 1974-05-25 | 1974-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-23 | 1978-05-25 | 1978-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-23 | 1982-05-25 | 1982-11-24 | $7700.00 | Window Closed / Lapsed |