US3543669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating ceiling construction
Assignee: BALDWIN EHRET HILL Inc
•
Filing: 1968-11-18
•
Granted: 1970-12-01
•
Expires: 1988-11-18
Abstract
No abstract record available.
Inventors
- 👤 Michael J Kodaras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:37
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/072; E; E04; E04B; E04B9/00; E04B9/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |