Patent US3424915A successfully refreshed from Google Patents.
US3424915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric loop length detector with optical biasing means for the photocells
Assignee: Ampex Corp
•
Filing: 1966-06-07
•
Granted: 1969-01-28
•
Expires: 1986-06-07
Abstract
No abstract record available.
Inventors
- 👤 Jerry R Youngstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:27
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/56; G11B15/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A LOOP LENGTH SENSING SYSTEM FOR A LOOP FORMING CHAMBER IN A WEB TRANSPORT SYSTEM COMPRISING THE COMBINATION OF: AN ARRAY OF LIGHT SENSITIVE ELEMENTS DISPOSED ALONG ONE WALL OF THE CHAMBER; LIGHT SOURCE MEANS DISPOSED ALONG A SECOND WALL OF THE CHAMBER AND POSITIONED TO PROVIDE A LIGHT PATH TO SAID LIGHT SENSITIVE MEANS THAT IS INTERCEPTED TO A VARIABLE LENGTH BY THE LOOP WITHIN THE CHAMBER; AND OPTICAL COUPLING MEANS DISPOSED ALONG SAID LIGHT SOURCE MEANS AND ALONG THE PHOTOSENSITIVE ELEMENTS AND OVERLAPPING A PORTION THEREOF, TO PROVIDE CONSTANT EXCITATION OF SAID ARRAY FROM SAID LIGHT SOURCE MEANS INDEPENDENT OF THE POSITION OF THE LOOP IN THE CHAMBER.
Claim 2
Dependent Claim
110 words
A LOOP LENGTH SENSING SYSTEM FOR A LOOP FORMING CHAMBER IN A WEB TRANSPORT SYSTEM COMPRISING THE COMBINATION OF: AN ARRAY OF LIGHT SENSITIVE ELEMENTS DISPOSED ALONG ONE WALL OF THE CHAMBER; LIGHT SOURCE MEANS DISPOSED ALONG A SECOND WALL OF THE CHAMBER AND POSITIONED TO PROVIDE A LIGHT PATH TO SAID LIGHT SENSITIVE MEANS THAT IS INTERCEPTED TO A VARIABLE LENGTH BY THE LOOP WITHIN THE CHAMBER; AND OPTICAL COUPLING MEANS DISPOSED ALONG SAID LIGHT SOURCE MEANS AND ALONG THE PHOTOSENSITIVE ELEMENTS AND OVERLAPPING A PORTION THEREOF, TO PROVIDE CONSTANT EXCITATION OF SAID ARRAY FROM SAID LIGHT SOURCE MEANS INDEPENDENT OF THE POSITION OF THE LOOP IN THE CHAMBER.
References Cited (Backward Citations)
US2907565A
Cited
US3195398A
Cited
US3197645A
Cited
GB956636A
Cited
US3236429A
Cited
US3250480A
Cited
US3240411A
Cited
US3354318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |