US3228285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linkage for photogrammetric projection instrument
Assignee: KELSH INSTRUMENT CO Inc
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Filing: 1963-06-05
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Granted: 1966-01-11
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Expires: 1983-06-05
Abstract
No abstract record available.
Inventors
- 👤 Harry T Kelsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:47
CPC Classifications
G; G01; G01C; G01C11/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
103 words
A PHOTOGRAMMETRIC PROJECTION INSTRUMENT HAVING A FRAME, A FIXED LENS MOUNTED ON THE FRAME, SAID LENS HAVING AN ENTRANCE NODE AND AN EXIT NODE, A MOVABLE TRACING TABLE ON THE LIGHT EMERGING SIDE OF THE LENS, SAID TABLE HAVING A TRACING POINT, A LIGHT SOURCE ON THE LIGHT INCIDENT SIDE OF THE LENS, AND MEANS FOR CONSTRAINING THE TRACING TABLE AND LIGHT SOURCE TO MOVE SO THAT THE ENTRANCE NODE IS ALWAYS IN LINE WITH THE PROJECTION AXIS OF THE LIGHT SOURCE, AND THE CENTER OF THE PLATED OF THE TRACING TABLE IS ALWAYS IN A LINE WITH THE EXIT NODE PARALLEL TO
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) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |