US3307774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum ion pump
Assignee: US Philips Corp
•
Filing: 1964-11-09
•
Granted: 1967-03-07
•
Expires: 1984-11-09
Abstract
No abstract record available.
Inventors
- 👤 Bannock Roy Robert
- 👤 Pressel Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:04
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/12; H01J41/18; H01J41/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
IN A VACUUM ION PUMP AT LEAST ONE ANODE AND AN ASSOCIATED CATHODE SPACED FROM SAID ANODE, THE SPACING BETWEEN THE ANODE AND CATHODE BEING TAPERED IN A LONGITUDINAL DIRECTION WHICH PROVIDES SPACING WHICH INCREASES TOWARDS AN EXHAUST PORT SPACED FROM SAID ANODE AND SAID CATHODE FOR COMMUNICATION TO AN ATMOSPHERE TO BE PUMPED.
Claim 2
Dependent Claim
54 words
IN A VACUUM ION PUMP AT LEAST ONE ANODE AND AN ASSOCIATED CATHODE SPACED FROM SAID ANODE, THE SPACING BETWEEN THE ANODE AND CATHODE BEING TAPERED IN A LONGITUDINAL DIRECTION WHICH PROVIDES SPACING WHICH INCREASES TOWARDS AN EXHAUST PORT SPACED FROM SAID ANODE AND SAID CATHODE FOR COMMUNICATION TO AN ATMOSPHERE TO BE PUMPED.
References Cited (Backward Citations)
US3080104A
Cited
US3239133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |