Patent US3294005A successfully refreshed from Google Patents.
US3294005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for providing an air barrier
Assignee: NATIONAL AIR PRODUCTS Inc
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Filing: 1964-07-28
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Granted: 1966-12-27
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Expires: 1984-07-28
Abstract
No abstract record available.
Inventors
- 👤 Herman M Melzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:45
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0405; F24H3/0411; F24F; F24F9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
179 words
A DEVICE FOR GENERATING AN AIR FLOW OF PRESCRIBED DIMENSION AND VELOCITY AND DIRECTION IT ACROSS AN ACCESS DOOR OR OTHER OPENING TO SERVE AS A BARRIER TO THE PASSAGE OF HEAT, INSECTS, AND OTHER BODIES THERETHROUGH, COMPRISING: A CASING HAVING A VOLUTE-SHAPED CHAMBER AT LEAST PARTIALLY LINED WITH A SOUND-SUPPRESSING MATERIAL; A MOTOR AND AT LEAST ONE ROTATABLE BLOWER WHEEL DRIVEN THEREBY AND HAVING A PLURALITY OF SPACED IMPELLERS DISPOSED WITHIN SAID CHAMBER AND ROTATABLE TO EFFECT A SUBSTANTIALLY CONSTANT SUPERATMOSHERIC PRESSURE INTERNALLY OF SAID CHAMBER DURING THEIR ROTATION BY SAID MOTOR; A DISCHARGE SLOT INCLUDING A PLURALITY OF ADJUSTABLE VANES FOR DIRECTING THE FLOW OF AIR AS IT PASSES THROUGH SAID SLOT; INLET MEANS AT THE OPPOSITE ENDS OF SAID CASING DEFINED BY A PLURALITY OF CONCENTRIC ANNULAR INLET PASSAGES AND INCLUDING ANGULARLY MOVABLE BAFFLE MEANS FOR CONTROLLING THE EFFECTIVE AREA OF SAID INLET PASSAGES, AND A CHAMBER HAVING A PLURALITY OF COILS OF INCREASING DIAMETER WHICH PROVIDE RESISTANCE ELEMENT EFFECTIVE FOR HEATING THE FLOW OF AIR AS IT PASSES THROUGH SAID INLET MEANS INTO SAID CASING,
Claim 2
Independent Claim
179 words
A DEVICE FOR GENERATING AN AIR FLOW OF PRESCRIBED DIMENSION AND VELOCITY AND DIRECTION IT ACROSS AN ACCESS DOOR OR OTHER OPENING TO SERVE AS A BARRIER TO THE PASSAGE OF HEAT, INSECTS, AND OTHER BODIES THERETHROUGH, COMPRISING: A CASING HAVING A VOLUTE-SHAPED CHAMBER AT LEAST PARTIALLY LINED WITH A SOUND-SUPPRESSING MATERIAL; A MOTOR AND AT LEAST ONE ROTATABLE BLOWER WHEEL DRIVEN THEREBY AND HAVING A PLURALITY OF SPACED IMPELLERS DISPOSED WITHIN SAID CHAMBER AND ROTATABLE TO EFFECT A SUBSTANTIALLY CONSTANT SUPERATMOSHERIC PRESSURE INTERNALLY OF SAID CHAMBER DURING THEIR ROTATION BY SAID MOTOR; A DISCHARGE SLOT INCLUDING A PLURALITY OF ADJUSTABLE VANES FOR DIRECTING THE FLOW OF AIR AS IT PASSES THROUGH SAID SLOT; INLET MEANS AT THE OPPOSITE ENDS OF SAID CASING DEFINED BY A PLURALITY OF CONCENTRIC ANNULAR INLET PASSAGES AND INCLUDING ANGULARLY MOVABLE BAFFLE MEANS FOR CONTROLLING THE EFFECTIVE AREA OF SAID INLET PASSAGES, AND A CHAMBER HAVING A PLURALITY OF COILS OF INCREASING DIAMETER WHICH PROVIDE RESISTANCE ELEMENT EFFECTIVE FOR HEATING THE FLOW OF AIR AS IT PASSES THROUGH SAID INLET MEANS INTO SAID CASING,
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) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |