US3273632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire damper
Assignee: —
•
Filing: —
•
Granted: 1966-09-20
•
Expires: 1983-09-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:18
CPC Classifications
A; A62; A62C; A62C2/00; A62C2/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A BLADE ASSEMBLY FOR A FOLDING SHUTTER COMPRISING A PLURALITY OF ONE PIECE BLADES EACH OF WHICH IS FORMED FROM SUBSTANTIALLY CONSTANT THICKNESS SHEET MATERIAL, EACH BLADE INCLUDING A CENTRAL WEB AND A PAIR OF PARALLEL EXTENDING HINGE ELEMENT FORMED RESPECTIVELY AT OPPOSITE EDGES OF SAID WEB AND EXTENDING LONGITUDINALLY CONTINUOUSLY FOR SUBSTANTIALLY THE FULL WEB LENGTH, ONE HINGE ELEMENT ON ONE BLADE BEING INTERFITTABLE WITHIN A HINGE ELEMENT ON AN ADJACENT BLADE BY SLIDING THE FORMER ENDWISE INTO THE LATTER TO FORM A HINGED BLADE PAIR, EACH OF SAID HINGED BLADES OF SAID PAIR WHEN INTERFITTED WITH THE OTHER BEING
Claim 2
Dependent Claim
101 words
A BLADE ASSEMBLY FOR A FOLDING SHUTTER COMPRISING A PLURALITY OF ONE PIECE BLADES EACH OF WHICH IS FORMED FROM SUBSTANTIALLY CONSTANT THICKNESS SHEET MATERIAL, EACH BLADE INCLUDING A CENTRAL WEB AND A PAIR OF PARALLEL EXTENDING HINGE ELEMENT FORMED RESPECTIVELY AT OPPOSITE EDGES OF SAID WEB AND EXTENDING LONGITUDINALLY CONTINUOUSLY FOR SUBSTANTIALLY THE FULL WEB LENGTH, ONE HINGE ELEMENT ON ONE BLADE BEING INTERFITTABLE WITHIN A HINGE ELEMENT ON AN ADJACENT BLADE BY SLIDING THE FORMER ENDWISE INTO THE LATTER TO FORM A HINGED BLADE PAIR, EACH OF SAID HINGED BLADES OF SAID PAIR WHEN INTERFITTED WITH THE OTHER BEING
References Cited (Backward Citations)
US790632A
Cited
US848853A
Cited
US1205707A
Cited
US1939728A
Cited
US2586561A
Cited
US2804641A
Cited
US2992450A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |