Patent BE640458A successfully refreshed from Google Patents.
US3245084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetically biased recording stylus
Assignee: Bausch and Lomb Inc
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Filing: 1964-03-23
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Granted: 1966-04-05
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Expires: 1984-03-23
Abstract
No abstract record available.
Inventors
- 👤 Kuyt Frits
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:47
CPC Classifications
G; G01; G01D; G01D15/00; G01D15/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A RECORDING DEVICE INCLUDING A PLATEN OF MAGNETIC MATERIAL, A STYLUS, MEANS SUPPORTING SAID STYLUS FOR ENGAGEMENT WITH SAID PLATEN, A MAGNETIC MEANS MOUNTED ON SAID MEANS SUPPORTING SAID STYLUS FOR MOVEMENT RELATIVE TO SAID PLATEN AND FORMING A MAGNETIC CIRCUIT WITH SAID PLATEN, ADJUSTING MEANS ON SAID MEANS SUPPORTING SAID SYTLUS ADJUSTABLY CONTROLLING THE LENGTH OF AIR GAP AND THE FLUX DENSITY IN THE MAGNETIC CIRCUIT TO VARY THE PRESSURE OF SAID STYLUS ON SAID PLATEN.
Claim 2
Dependent Claim
77 words
A RECORDING DEVICE INCLUDING A PLATEN OF MAGNETIC MATERIAL, A STYLUS, MEANS SUPPORTING SAID STYLUS FOR ENGAGEMENT WITH SAID PLATEN, A MAGNETIC MEANS MOUNTED ON SAID MEANS SUPPORTING SAID STYLUS FOR MOVEMENT RELATIVE TO SAID PLATEN AND FORMING A MAGNETIC CIRCUIT WITH SAID PLATEN, ADJUSTING MEANS ON SAID MEANS SUPPORTING SAID SYTLUS ADJUSTABLY CONTROLLING THE LENGTH OF AIR GAP AND THE FLUX DENSITY IN THE MAGNETIC CIRCUIT TO VARY THE PRESSURE OF SAID STYLUS ON SAID PLATEN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-04 | 1969-10-04 | 1970-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-04 | 1973-10-04 | 1974-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-04 | 1977-10-04 | 1978-04-05 | $7700.00 | Window Closed / Lapsed |