US4138670B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
A.C. powered detecting device with battery backup
Assignee: Pittway Corp
•
Filing: 1977-01-03
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Granted: 1994-07-26
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Expires: 1997-01-03
Abstract
No abstract record available.
Inventors
- 👤 Quentin L Schneider
- 👤 Richard J Schwarzbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:38
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/165; G01R19/16533; G01R19/16538; G01R19/16542; G08; G08B; G08B17/00; G08B17/10; G08B17/11; G08B29/00; G08B29/18; G08B29/181
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-25 | 1998-01-24 | 1998-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-25 | 2002-01-24 | 2002-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-25 | 2006-01-24 | 2006-07-26 | $7700.00 | Window Closed / Lapsed |