Patent US1436738A successfully refreshed from Google Patents.
Patent US3103154A successfully refreshed from Google Patents.
US3103154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bomb shelter ventilation apparatus
Assignee: Individual
•
Filing: 1961-12-06
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Granted: 1963-09-10
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Expires: 1981-12-06
Abstract
No abstract record available.
Inventors
- 👤 Morton M Rosenfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:01
CPC Classifications
A; A62; A62B; A62B13/00; E; E04; E04H; E04H9/00; E04H9/04; Y; Y10; Y10S; Y10S454/00; Y10S454/902
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
APPARATUS COMPRISING MEANS DEFINING AN UNDERGROUND ENCLOSURE, A VENT PIPE PROVIDING COMMUNICATION BETWEEN THE ATMOSPHERE AND THE INTERIOR OF SAID ENCLOSURE, A BLOWER HAVING AN INLET AND AN OUTLET, A FLEXIBLE CONDUIT, A FILTER CONNECTED BETWEEN ONE END OF SAID FLEXIBLE CONDUIT AND SAID VENT PIPE, A DUST TRAP BETWEEN SAID FILTER AND SAID VENT PIPE, SAID DUST TRAP HAVING A PARTITION THEREIN FOR CAUSING AIR FLOWING THERETHROUGH TO FLOW THROUGH A DOWNWARDLY EXTENDING CIRCUITOUS PATH, A SECOND DUST TRAP HAVING A PARTITION THEREIN FOR CAUSING AIR FLOWING THERETHROUGH TO FLOW THROUGH A DOWNWARDLY EXTENDING CIRCUITOUS PATH, SAID SECOND DUST TRAP BEING CONNECTED BETWEEN SAID ONE END OF SAID FLEXIBLE CONDUIT AND SAID FILTER, MEANS REMOVABLY CONNECTING THE OTHER END OF SAID FLEXIBLE CONDUIT TO THE INLET OF SAID BLOWER, AND THE OUTLET OF SAID BLOWER BEING IN COMMUNICATION WITH THE INTERIOR OF SAID ENCLOSURE.
Claim 2
Dependent Claim
145 words
APPARATUS COMPRISING MEANS DEFINING AN UNDERGROUND ENCLOSURE, A VENT PIPE PROVIDING COMMUNICATION BETWEEN THE ATMOSPHERE AND THE INTERIOR OF SAID ENCLOSURE, A BLOWER HAVING AN INLET AND AN OUTLET, A FLEXIBLE CONDUIT, A FILTER CONNECTED BETWEEN ONE END OF SAID FLEXIBLE CONDUIT AND SAID VENT PIPE, A DUST TRAP BETWEEN SAID FILTER AND SAID VENT PIPE, SAID DUST TRAP HAVING A PARTITION THEREIN FOR CAUSING AIR FLOWING THERETHROUGH TO FLOW THROUGH A DOWNWARDLY EXTENDING CIRCUITOUS PATH, A SECOND DUST TRAP HAVING A PARTITION THEREIN FOR CAUSING AIR FLOWING THERETHROUGH TO FLOW THROUGH A DOWNWARDLY EXTENDING CIRCUITOUS PATH, SAID SECOND DUST TRAP BEING CONNECTED BETWEEN SAID ONE END OF SAID FLEXIBLE CONDUIT AND SAID FILTER, MEANS REMOVABLY CONNECTING THE OTHER END OF SAID FLEXIBLE CONDUIT TO THE INLET OF SAID BLOWER, AND THE OUTLET OF SAID BLOWER BEING IN COMMUNICATION WITH THE INTERIOR OF SAID ENCLOSURE.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-09-09 | 1967-03-11 | 1967-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-09 | 1971-03-11 | 1971-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-09 | 1975-03-11 | 1975-09-10 | $7700.00 | Window Closed / Lapsed |