US3093056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilation system
Assignee: Individual
•
Filing: 1961-08-22
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Granted: 1963-06-11
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Expires: 1981-08-22
Abstract
No abstract record available.
Inventors
- 👤 Morton M Rosenfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:45
CPC Classifications
A; A62; A62B; A62B13/00; E; E04; E04H; E04H9/00; E04H9/04; E04H9/10; E04H9/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A VENTILATION SYSTEM COMPRISING AN UNDERGROUND ENCLOSURE, MEANS PROVIDING ENTRY AND EXIT TO SAID ENCLOSURE, AN INTAKE PIPE HAVING A FIRST END IN COMMUNICATION WITH SAID ENCLOSURE AND A SECOND END ABOVE GROUND LEVEL, AN EXHAUST PIPE HAVING A FIRST END IN COMMUNICATION WITH SAID ENCLOSURE AND A SECOND END ABOVE GROUND LEVEL, A HOOD SUPPORTED ON THE SECOND END OF EACH PIPE, AND A TAMPERPROOF SHIELD SURROUNDING EACH HOOD AND THE PORTION OF EACH PIPE DISPOSED ABOVE GROUND LEVEL, THE SHIELD COMPRISING A TUBULAR MAIN BODY HAVING A CLOSED IMPERFORATED UPPER END SPACED ABOVE SAID HOOD AND EXTENDING TO BELOW THE GROUND LEVEL TO BE SECURED THEREIN, SAID TUBULAR MAIN BODY HAVING AIR VENTS THEREIN.
Claim 2
Dependent Claim
116 words
A VENTILATION SYSTEM COMPRISING AN UNDERGROUND ENCLOSURE, MEANS PROVIDING ENTRY AND EXIT TO SAID ENCLOSURE, AN INTAKE PIPE HAVING A FIRST END IN COMMUNICATION WITH SAID ENCLOSURE AND A SECOND END ABOVE GROUND LEVEL, AN EXHAUST PIPE HAVING A FIRST END IN COMMUNICATION WITH SAID ENCLOSURE AND A SECOND END ABOVE GROUND LEVEL, A HOOD SUPPORTED ON THE SECOND END OF EACH PIPE, AND A TAMPERPROOF SHIELD SURROUNDING EACH HOOD AND THE PORTION OF EACH PIPE DISPOSED ABOVE GROUND LEVEL, THE SHIELD COMPRISING A TUBULAR MAIN BODY HAVING A CLOSED IMPERFORATED UPPER END SPACED ABOVE SAID HOOD AND EXTENDING TO BELOW THE GROUND LEVEL TO BE SECURED THEREIN, SAID TUBULAR MAIN BODY HAVING AIR VENTS THEREIN.
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) | 1966-06-10 | 1966-12-10 | 1967-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-10 | 1970-12-10 | 1971-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-10 | 1974-12-10 | 1975-06-11 | $7700.00 | Window Closed / Lapsed |