US3229281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic-field-operable changeable symbol system
Assignee: MAGNETOSCOPICS Inc
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Filing: 1963-03-26
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Granted: 1966-01-11
•
Expires: 1983-03-26
Abstract
No abstract record available.
Inventors
- 👤 Hackenfort Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:25
CPC Classifications
G; G08; G08B; G08B5/00; G08B5/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
A MAGNETIC-FIELD-OPERABLE SYMBOL SYSTEM COMPRISING A VIEWABLE HOLDER CONTAINING SUSPENDIBLE MAGNETIC PARTICLES IN A LIQUID MEDIUM, AND A MAGNETIC CIRCUIT PROVIDED WITH A MAGNETIC FIELD CREATING MEANS IN THE
Claim 2
Dependent Claim
29 words
A MAGNETIC-FIELD-OPERABLE SYMBOL SYSTEM COMPRISING A VIEWABLE HOLDER CONTAINING SUSPENDIBLE MAGNETIC PARTICLES IN A LIQUID MEDIUM, AND A MAGNETIC CIRCUIT PROVIDED WITH A MAGNETIC FIELD CREATING MEANS IN THE
References Cited (Backward Citations)
US1069582A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |