US3497303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoke detector including porous housing means
Assignee: Electro Signal Lab Inc
•
Filing: 1967-07-11
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Granted: 1970-02-24
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Expires: 1987-07-11
Abstract
No abstract record available.
Inventors
- 👤 Robert B Enemark
- 👤 Donald F Steele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:35
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/49; G01N21/53; G01N2201/00; G01N2201/06; G01N2201/063; G01N2201/0638; G01N2201/0639
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) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |