Patent US3473874A successfully refreshed from Google Patents.
US3473874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical gates
Assignee: Newman and Guardia Ltd
•
Filing: 1966-08-16
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Granted: 1969-10-21
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Expires: 1986-08-16
Abstract
No abstract record available.
Inventors
- 👤 Henry J Hall
- 👤 Arthur E Rodda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:39
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/46; G03B27/475
Claims Analysis
Total Claims: 0
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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) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |