Patent US1612100A successfully refreshed from Google Patents.
US2981866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cool dimmer device for incandescent lamps
Assignee: Individual
•
Filing: 1959-03-06
•
Granted: 1961-04-25
•
Expires: 1979-03-06
Abstract
No abstract record available.
Inventors
- 👤 Hsue C Tsien
- 👤 Pao H Chin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:00
CPC Classifications
H; H05; H05B; H05B39/00; H05B39/04; H05B39/06; Y; Y10; Y10S; Y10S315/00; Y10S315/03
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
FR515184A
Cited
US1749520A
Cited
US1830531A
Cited
US2431080A
Cited
US2511558A
Cited
US2896125A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |