US2518690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of envelopes having glass windows, such as the envelopes for cathode-raytubes or the like
Assignee: EMI Ltd
•
Filing: 1948-06-25
•
Granted: 1950-08-15
•
Expires: 1968-06-25
Abstract
No abstract record available.
Inventors
- 👤 Holman Herbert Edward
- 👤 Pearce Ralph Reginald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:46
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/20; C03B23/207; C03B23/217; C03B23/0073; H; H01; H01J; H01J9/00; H01J9/24; H01J9/26; H01J9/263
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1979573A
Cited
US2346470A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-14 | 1954-02-13 | 1954-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-14 | 1958-02-13 | 1958-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-14 | 1962-02-13 | 1962-08-15 | $7700.00 | Window Closed / Lapsed |