US3380335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Observation port
Assignee: Individual
•
Filing: 1964-02-28
•
Granted: 1968-04-30
•
Expires: 1984-02-28
Abstract
No abstract record available.
Inventors
- 👤 Clave Serge
- 👤 Clave Marcel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:20
CPC Classifications
G; G21; G21F; G21F7/00; G21F7/02; G02; G02B; G02B23/00; G02B23/24; G02B23/2407
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
AN IMPROVED OBSERVATION PORT COMPRISING IN COMBINATION AFOCAL OPTICAL FIELD REDUCING AND FIELD ENLARGING MEANS IN OPTICAL ALIGNMENT WITH EACH OTHER, EACH AFOCAL OPTICAL MEANS COMPRISING PLANO-CONCAVE AND PLANO-CONVEX LENSES SEPARATED BY A DISTANCE EQUAL TO THE DIFFERENCE BETWEEN THEIR FOCAL LENGTHS, AND TRANSPARENT MEANS MADE OF A MATERIAL AFFORDING PROTECTION AGAINST RADIATION FROM ONE SIDE OF THE PORT TO THE OTHER, SAID TRANSPARENT MEANS BEING
Claim 2
Dependent Claim
66 words
AN IMPROVED OBSERVATION PORT COMPRISING IN COMBINATION AFOCAL OPTICAL FIELD REDUCING AND FIELD ENLARGING MEANS IN OPTICAL ALIGNMENT WITH EACH OTHER, EACH AFOCAL OPTICAL MEANS COMPRISING PLANO-CONCAVE AND PLANO-CONVEX LENSES SEPARATED BY A DISTANCE EQUAL TO THE DIFFERENCE BETWEEN THEIR FOCAL LENGTHS, AND TRANSPARENT MEANS MADE OF A MATERIAL AFFORDING PROTECTION AGAINST RADIATION FROM ONE SIDE OF THE PORT TO THE OTHER, SAID TRANSPARENT MEANS BEING
References Cited (Backward Citations)
AT79184B
Cited
US3052151A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |