Patent US3428197A successfully refreshed from Google Patents.
US3428197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum entry mechanism
Assignee: International Business Machines Corp
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Filing: 1966-04-13
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Granted: 1969-02-18
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Expires: 1986-04-13
Abstract
No abstract record available.
Inventors
- 👤 Christopher L Fischer
- 👤 Kenneth E Haughton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:18
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/865; H01J5/00; H01J5/20; H01J5/22; H01J5/30; H01J2893/00; H01J2893/0033; H01J2893/0045
Claims Analysis
Total Claims: 0
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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) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |