US3356887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fe cathode redesign
Assignee: Individual
•
Filing: 1965-07-30
•
Granted: 1967-12-05
•
Expires: 1985-07-30
Abstract
No abstract record available.
Inventors
- 👤 Frederick C W Heil
- 👤 Eugene E Martin
- 👤 Noel A Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:38
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/30; H01J1/304
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A FIELD EMISSION CATHODE COMPRISING: AN ELONGATED, CYLINDRICAL METALLIC ROD, A SLIT IN SAID ROD ALONG THE GREATER PORTION OF ITS LENGTH, AND A CONICAL TAPER ON THE CONICAL END OF SAID ROD TERMINATING IN A SLIGHTLY ROUNDED TIP FROM WHICH ELECTRONS ARE EMITTED WHEN SAID ROD IS SUBJECTED TO AN APPLIED ELECTRIC FIELD.
Claim 2
Dependent Claim
54 words
A FIELD EMISSION CATHODE COMPRISING: AN ELONGATED, CYLINDRICAL METALLIC ROD, A SLIT IN SAID ROD ALONG THE GREATER PORTION OF ITS LENGTH, AND A CONICAL TAPER ON THE CONICAL END OF SAID ROD TERMINATING IN A SLIGHTLY ROUNDED TIP FROM WHICH ELECTRONS ARE EMITTED WHEN SAID ROD IS SUBJECTED TO AN APPLIED ELECTRIC FIELD.
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) | 1970-12-04 | 1971-06-05 | 1971-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-04 | 1975-06-05 | 1975-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-04 | 1979-06-05 | 1979-12-05 | $7700.00 | Window Closed / Lapsed |