US2918938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve construction
Assignee: GTE Sylvania Inc
•
Filing: 1954-03-23
•
Granted: 1959-12-29
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Expires: 1974-03-23
Abstract
No abstract record available.
Inventors
- 👤 Lawrence W Kimball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:28
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/38; Y; Y10; Y10T; Y10T137/00; Y10T137/4238; Y10T137/4358; Y10T137/4442; Y10T137/8593; Y10T137/86493; Y10T137/86501; Y10T137/86509; Y10T137/86517; Y10T137/86533; Y10T137/86558
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1976417A
Cited
US1911044A
Cited
US2349822A
Cited
US2504925A
Cited
US2677391A
Cited
US2592705A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-28 | 1963-06-29 | 1963-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-28 | 1967-06-29 | 1967-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-28 | 1971-06-29 | 1971-12-29 | $7700.00 | Window Closed / Lapsed |