Patent US3534217A successfully refreshed from Google Patents.
US3534217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Incandescent lamp having an envelope with a cap formed on the base thereof to prevent axial moving relative to said cap
Assignee: British Lighting Industries Ltd
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Filing: 1969-05-23
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Granted: 1970-10-13
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Expires: 1989-05-23
Abstract
No abstract record available.
Inventors
- 👤 Arthur Samuel Vause
- 👤 George Douglas Sparrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:24
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/50; H01J5/54; H01J5/58; H01J5/60
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) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |