US3234536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical control system
Assignee: Specialties Development Corp
•
Filing: 1963-02-20
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Granted: 1966-02-08
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Expires: 1983-02-20
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry C Grant
- 👤 Malcolm W Loihle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:26
CPC Classifications
G; G08; G08B; G08B29/00; G08B29/12; G08B29/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
139 words
IN AN ELECTRICAL CONTROL SYSTEM FOR SMOKE DETECTING APPARATUS INCLUDING A PLURALTIY OF CONDUITS FOR SUPPLYING AIR SAMPLES FROM SPACES IN WHICH SMOKE IS TO BE DETECTED, A DETECTOR FOR GIVING AN INDICATION IN RESPONSE TO THE PRESENCE OF SMOKE, A SELECTOR VALVE FOR CONNECTING THE DETECTOR TO EACH OF THE CONDUITS, AND MOTOR MEANS FOR DRIVING SAID VALVE TO SEQUENTIALLY CONNECT THE DETECTOR TO EACH OF THE CONDUIT; THE COMBINATION OF TIMING MEANS FOR CONTROLLING SAID MOTOR MEANS TO CONNECT EACH OF SAID LINES TO SAID DETECTOR FOR A PREDETERMINED INTERVAL OF TIME, AND INDICATION HOLD-OFF MEANS UNDER THE CONTROL OF SAID TIMING MEANS FOR RENDERING SAID DETECTOR INEFFECTIVE DURING A PREDETERMINED INITIAL PORTION OF SAID INTERVAL OF TIME WHEREBY SAID DETECTOR IS PREVENTED FROM GIVING AN INDICATION AFTER SAID DETECTOR IS DISCONNECTED FROM A CONDUIT TRANSMITTING SMOKE.
References Cited (Backward Citations)
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Cited
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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) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |