US3553710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Erasable trace recorder
Assignee: Individual
•
Filing: 1969-03-14
•
Granted: 1971-01-05
•
Expires: 1989-03-14
Abstract
Abstract A SOURCE OF ULTRAVIOLET RADIATION ILLUMINATES THE STYLUSDRAWN INK TRACE ON THE RECORDING SURFACE OF A CHART-TYPE RECODER. THE INK IS COMPOUND OF A DYE THAT IS FADED TO EXTINCTION BY THE ULTRAVIOLET RADIATION THEREBY AUTOMATICALLY EXPUNGING THE TRACE. ALTERNATIVELY, THE INK MAY
Inventors
- 👤 Edward C Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:19
CPC Classifications
G; G01; G01D; G01D15/00; G01D15/28; G01D15/32
Claims Analysis
Total Claims: 0
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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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |