Patent US2302443A successfully refreshed from Google Patents.
US3289192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air flow monitoring enclosure intrusion alarm having retarded flowmeter
Assignee: Individual
•
Filing: 1964-04-10
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Granted: 1966-11-29
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Expires: 1984-04-10
Abstract
No abstract record available.
Inventors
- 👤 Peter G Davey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:40
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
AN ALARM SYSTEM FOR A SUBSTANTIALLY SEALED ENCLOSURE COMPRISING A FLOWMETER DISPOSED WITHIN SAID ENCLOSURE AND HAVING A TUBE EXTENDING THROUGH A WALL OF SAID ENCLOSURE FOR PRODUCING A SIGNAL RESPONSIVE TO AIR FLOW THROUGH SAID TUBE AS ESTABLISHING BY A PRESSURE DIFFERENTIAL ACROSS SAID WALL, MEANS DEFINING A RESTRICTION IN THE TUBE OF THE FLOWMETER, MEANS DEFINING AN AIR CHAMBER CONNECTED BETWEEN THE FLOWMETER AND RESTRICTION FOR DELAYING FLOWMETER RESPONSE TO CHANGES IN AIR FLOW THERETO, AND PUMP MEANS EXTENDING THROUGH SAID WALL AND PRODUCING A SUBSTANTIALLY STEADY PRESSURE DIFFERENTIAL ACROSS SAID WALL, WHEREBY OPENING OF THE ENCLOSURE VARIES SAID PRESSURE DIFFERENTIAL TO VARY THE FLOWMETER SIGNAL AS AN INDICATION OF ENCLOSURE OPENING.
Claim 2
Dependent Claim
114 words
AN ALARM SYSTEM FOR A SUBSTANTIALLY SEALED ENCLOSURE COMPRISING A FLOWMETER DISPOSED WITHIN SAID ENCLOSURE AND HAVING A TUBE EXTENDING THROUGH A WALL OF SAID ENCLOSURE FOR PRODUCING A SIGNAL RESPONSIVE TO AIR FLOW THROUGH SAID TUBE AS ESTABLISHING BY A PRESSURE DIFFERENTIAL ACROSS SAID WALL, MEANS DEFINING A RESTRICTION IN THE TUBE OF THE FLOWMETER, MEANS DEFINING AN AIR CHAMBER CONNECTED BETWEEN THE FLOWMETER AND RESTRICTION FOR DELAYING FLOWMETER RESPONSE TO CHANGES IN AIR FLOW THERETO, AND PUMP MEANS EXTENDING THROUGH SAID WALL AND PRODUCING A SUBSTANTIALLY STEADY PRESSURE DIFFERENTIAL ACROSS SAID WALL, WHEREBY OPENING OF THE ENCLOSURE VARIES SAID PRESSURE DIFFERENTIAL TO VARY THE FLOWMETER SIGNAL AS AN INDICATION OF ENCLOSURE OPENING.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |