Patent US2728068A successfully refreshed from Google Patents.
US2728068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire detector
Assignee: AMERICAN PHENOLIC Corp
•
Filing: 1949-05-19
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Granted: 1955-12-20
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Expires: 1969-05-19
Abstract
No abstract record available.
Inventors
- 👤 Charles J Adams
- 👤 John A Proctor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:30
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1205434A
Cited
US1450125A
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DE401667C
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US1573033A
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US1780302A
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US2037155A
Cited
US2067959A
Cited
US2088485A
Cited
US2299533A
Cited
US2385487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-19 | 1959-06-20 | 1959-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-19 | 1963-06-20 | 1963-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-19 | 1967-06-20 | 1967-12-20 | $7700.00 | Window Closed / Lapsed |