Patent US1775531A successfully refreshed from Google Patents.
US1775531A
Expired / Lapsed
US
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Vacuum apparatus
Assignee: General Electric Co
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Filing: 1924-06-24
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Granted: 1930-09-09
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Expires: 1944-06-24
Abstract
No abstract record available.
Inventors
- 👤 Kramer Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:31
CPC Classifications
H; H01; H01J; H01J13/00; H01J13/02; H01J13/28; H01J13/32; H01J2893/00; H01J2893/0072; H01J2893/0073; H01J2893/0074; H01J2893/0086
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1933-09-08 | 1934-03-10 | 1934-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-09-08 | 1938-03-10 | 1938-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-09-08 | 1942-03-10 | 1942-09-09 | $7700.00 | Window Closed / Lapsed |