Patent US3561270A successfully refreshed from Google Patents.
US3561270A
Expired / Lapsed
US
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Age indicating device
Assignee: Dynametric Inc
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Filing: 1968-06-26
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Granted: 1971-02-09
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Expires: 1988-06-26
Abstract
Abstract AN AGE INDICATOR IS PROVIDED FOR ASCERTAINING THE EFFECT OF EXPOSURE OF ARTICLES, PARTICULARLY UNUSED PHOTOGRAPHIC SHEET MATERIAL, TO VARYING TEMPERATURE CONDITIONS ON THE USEFUL LIFE OF THE ARTICLE. A VOLTAGE IS DEVELOPED AS A FUNCTION OF THE TEMPERATURE CONDITIONS TO WHICH THE ARTICLE IS EXPOSED AT VARIOUS TIMES. THIS VOLTAGE IS APPLIED TO A CIRCUIT THAT INCLUDES A DIODE FOR DEVELOPING AN ELECTRICAL CURRENT PROPORTIONAL TO THE AGING RATE AND THIS CURRENT IS INTEGRATED AS A FUNCTION OF TIME TO PRODUCE THE DESIRED INDICATION OF THE AGING OF THE ARTICLE.
Inventors
- 👤 Donald K Sessler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:56
CPC Classifications
G; G01; G01K; G01K3/00; G01K3/02; G01K3/04; G03; G03B; G03B35/00; G03B35/18; G03B35/24
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |