US3421066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct current power supply system for emergency lighting systems and the like
Assignee: HAMPDEN ENG CO
•
Filing: 1966-03-31
•
Granted: 1969-01-07
•
Expires: 1986-03-31
Abstract
No abstract record available.
Inventors
- 👤 Daniel M Flynn
- 👤 Stanley J Bandoski Jr
- 👤 William R Clow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:59
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/50; H02J7/575
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2137349A
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US2759177A
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US3018432A
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US3204193A
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US3302091A
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US3310724A
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US3379953A
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US3321754A
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US3321690A
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US3329882A
Cited
US3356922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |