Patent US2531394A successfully refreshed from Google Patents.
US2531394A
Expired / Lapsed
US
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Apparatus for manufacture of precision glass tubing
Assignee: Farnsworth Research Corp
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Filing: 1945-06-02
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Granted: 1950-11-28
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Expires: 1965-06-02
Abstract
No abstract record available.
Inventors
- 👤 Clair E Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:30
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/04; C03B23/07; C03B23/073; C03B23/076; H; H01; H01J; H01J19/00; H01J19/42; H01J19/50; H01J19/52; H01J2893/00; H01J2893/0001; H01J2893/0002; H01J2893/0005; H01J2893/0009
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) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |