US3429250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating ceiling construction
Assignee: Wood Conversion Co
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Filing: 1962-04-17
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Granted: 1969-02-25
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Expires: 1982-04-17
Abstract
No abstract record available.
Inventors
- 👤 Michael J Kodaras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:22
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/072; E; E04; E04B; E04B9/00; E04B9/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
94 words
IN A VENTILATING CEILING CONSTRUCTION OF THE TYPE HAVING A MAIN CEILING AND A CEILING SUSPENDED BELOW THE MAIN CEILING, DEFINING A PLENUM CHAMBER BETWEEN THE MAIN AND THE SUSPENDED CEILING, SAID SUSPENDED CEILING COMPRISING RECTANGULAR PANELS, INVERTED T SUPPORT HAVING MEANS FOR SUPPORTING THE EDGES OF THE PANELS OF THE SUSPENDED CEILING, EACH OF SAID PANELS HAVING PASSAGES NEAR THE EDGES THEREOF AND EXTENDING THROUGH THE THICKNESS OF THE PANELS, SAID PASSAGES COMPRISING NOTCHES IN UNIFORMLY SPACED RELATION IN THE LONGITUDINAL EDGES OF THE PANELS, VENTING SLIDERS, SLIDABLY AJUSTABLE IN POSITION AND CARRIED
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) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |