Patent US3128340A successfully refreshed from Google Patents.
US3128340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrographic transmitter
Assignee: AT&T Inc
•
Filing: 1961-12-21
•
Granted: 1964-04-07
•
Expires: 1981-12-21
Abstract
No abstract record available.
Inventors
- 👤 Leon D Harmon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:26
CPC Classifications
G; G01; G01V; G01V8/00; G01V8/10; G01V8/12; G01V8/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
AN ELECTROGRAPHIC TRANSMITTER THAT COMPRISES A WRITING SURFACE, MEANS FOR EFFECTIVELY SWEEPING A BEAM OF LIGHT OVER SAID SURFACE IN A PLANE SUBSTANTIALLY PARALLEL TO AND A SMALL DISTANCE ABOVE SAID SURFACE, A PHOTOSENSITIVE ELEMENT POSITIONED TO CAPTURE THE LIGHT OF SAID BEAM THROUGHOUT ITS ENTIRE SWEEP OVER SAID WRITING SURFACE, AND MEANS FOR IDENTIFYING THAT INSTANT IN THE SWEEP OF SAID BEAM AT WHICH SAID PHOTOSENSITIVE ELEMENT IS SHADOWED BY AN OPAQUE OBJECT.
Claim 2
Dependent Claim
74 words
AN ELECTROGRAPHIC TRANSMITTER THAT COMPRISES A WRITING SURFACE, MEANS FOR EFFECTIVELY SWEEPING A BEAM OF LIGHT OVER SAID SURFACE IN A PLANE SUBSTANTIALLY PARALLEL TO AND A SMALL DISTANCE ABOVE SAID SURFACE, A PHOTOSENSITIVE ELEMENT POSITIONED TO CAPTURE THE LIGHT OF SAID BEAM THROUGHOUT ITS ENTIRE SWEEP OVER SAID WRITING SURFACE, AND MEANS FOR IDENTIFYING THAT INSTANT IN THE SWEEP OF SAID BEAM AT WHICH SAID PHOTOSENSITIVE ELEMENT IS SHADOWED BY AN OPAQUE OBJECT.
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) | 1967-04-07 | 1967-10-07 | 1968-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-07 | 1971-10-07 | 1972-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-07 | 1975-10-07 | 1976-04-07 | $7700.00 | Window Closed / Lapsed |