Patent US3309754A successfully refreshed from Google Patents.
US3309754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-regulating light-responsive devices
Assignee: Individual
•
Filing: 1965-05-26
•
Granted: 1967-03-21
•
Expires: 1985-05-26
Abstract
No abstract record available.
Inventors
- 👤 Metcalf Eric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:09
CPC Classifications
G; G01; G01V; G01V8/00; G01V8/10; G01V8/12; B; B65; B65H; B65H63/00; B65H63/06; B65H63/062; B65H63/065; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; B65H2701/00; B65H2701/30; B65H2701/31
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A YARN SLUB DETECTOR COMPRISING AN OPTICAL SYSTEM HAVING A LAMP AND A COOPERATING PHOTO-SENSITIVE DEVICE BETWEEN WHICH YARN MAY BE DRAWN, A FIRST TRANSISTOR AMPLIFIER RESPONSIVE TO VARIATIONS IN THE OUTPUT FROM SAID PHOTOSENSITIVE DEVICE WHICH EXCEED A DETERMINED TIME DURATION FOR CONTROLLING THE CURRENT THROUGH SAID LAMP, AND DISCRIMINATOR MEANS FOR DETECTING SHORT TERM VARIATIONS IN THE OUTPUT FROM SAID PHOTO-SENSITIVE DEVICE WHICH RESULT FROM THE PASSAGE OF AN IRREGULARITY IN SAID YARN THROUGH SAID OPTICAL SYSTEM AND FOR DELIVERING ELECTRICAL OUTPUT SIGNALS INDICATIVE OF SUCH SHORT TERM VARIATIONS.
Claim 2
Dependent Claim
91 words
A YARN SLUB DETECTOR COMPRISING AN OPTICAL SYSTEM HAVING A LAMP AND A COOPERATING PHOTO-SENSITIVE DEVICE BETWEEN WHICH YARN MAY BE DRAWN, A FIRST TRANSISTOR AMPLIFIER RESPONSIVE TO VARIATIONS IN THE OUTPUT FROM SAID PHOTOSENSITIVE DEVICE WHICH EXCEED A DETERMINED TIME DURATION FOR CONTROLLING THE CURRENT THROUGH SAID LAMP, AND DISCRIMINATOR MEANS FOR DETECTING SHORT TERM VARIATIONS IN THE OUTPUT FROM SAID PHOTO-SENSITIVE DEVICE WHICH RESULT FROM THE PASSAGE OF AN IRREGULARITY IN SAID YARN THROUGH SAID OPTICAL SYSTEM AND FOR DELIVERING ELECTRICAL OUTPUT SIGNALS INDICATIVE OF SUCH SHORT TERM VARIATIONS.
References Cited (Backward Citations)
US2548755A
Cited
US3030853A
Cited
US2936511A
Cited
US2927217A
Cited
US3128384A
Cited
US3053986A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-20 | 1970-09-19 | 1971-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-20 | 1974-09-19 | 1975-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-20 | 1978-09-19 | 1979-03-21 | $7700.00 | Window Closed / Lapsed |