US1289672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing and maintaining vacuums.
Assignee: General Electric Co
•
Filing: 1916-02-05
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Granted: 1918-12-31
•
Expires: 1936-02-05
Abstract
No abstract record available.
Inventors
- 👤 William D Coolidge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:49
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/20
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) | 1921-12-30 | 1922-07-01 | 1922-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1925-12-30 | 1926-07-01 | 1926-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1929-12-30 | 1930-07-01 | 1930-12-31 | $7700.00 | Window Closed / Lapsed |