Patent US1922984A successfully refreshed from Google Patents.
Patent US3307198A successfully refreshed from Google Patents.
US3307198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic recording utilizing tungsten-rhenium electrodes
Assignee: Unisys Corp
•
Filing: 1963-04-15
•
Granted: 1967-02-28
•
Expires: 1983-04-15
Abstract
No abstract record available.
Inventors
- 👤 John J Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:24
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/385; B41J2/39; B41J2/395
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
IN AN ELECTROSTATIC RECORDING HEAD INCLUDING AN ANODE BAR ELECTRODE AND A PLURALITY OF CATHODE PIN ELECTRODES POSITIONED CLOSELY TO SAID ANODE ELECTRODE BUT ELECTRICALLY INSULATED THEREFROM, AND FURTHER INCLUDING A SURROUNDING BODY OF ELECTRICALLY INSULATING MATERIAL ENCAPSULATING THE ELECTRODES THEREWITHIN EXCEPT FOR THE EXPOSURE OF THE TERMINAL ENDS THEREOF ACROSS WHICH A RELATIVELY HIGH VOLTAGE IS ESTABLISHED BY THE SELECTIVE APPLICATION OF NEGA-
Claim 2
Dependent Claim
64 words
IN AN ELECTROSTATIC RECORDING HEAD INCLUDING AN ANODE BAR ELECTRODE AND A PLURALITY OF CATHODE PIN ELECTRODES POSITIONED CLOSELY TO SAID ANODE ELECTRODE BUT ELECTRICALLY INSULATED THEREFROM, AND FURTHER INCLUDING A SURROUNDING BODY OF ELECTRICALLY INSULATING MATERIAL ENCAPSULATING THE ELECTRODES THEREWITHIN EXCEPT FOR THE EXPOSURE OF THE TERMINAL ENDS THEREOF ACROSS WHICH A RELATIVELY HIGH VOLTAGE IS ESTABLISHED BY THE SELECTIVE APPLICATION OF NEGA-
References Cited (Backward Citations)
US1840457A
Cited
US2391458A
Cited
US2640135A
Cited
US2719775A
Cited
GB816136A
Cited
US2867491A
Cited
US2918580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |