US3573223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoke generator with automatic control system therefor
Assignee: Speco Inc
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Filing: 1968-10-14
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Granted: 1971-03-30
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Expires: 1988-10-14
Abstract
Abstract A CONTROL SYSTEM FOR A FRICTION-TYPE SMOKE GENERATOR WHEREIN THE PRESSURE WHICH IS EXERTED BY THE WOODEN SMOKE-PRODUCING BLOCK AGAINST THE USUAL ROTATING FRICTION WHEEL IS REGULATED ACCORDING TO THE ELECTRICAL CURRENT WHICH IS SUPPLIED TO THE MOTOR FOR DRIVING THE FRICTION WHEEL.
Inventors
- 👤 Chester A Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:40
CPC Classifications
H; H02; H02P; H02P29/00; H02P29/40
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |