US2973703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air regulation means in a sound absorbing and ventilating ceiling
Assignee: Johns Manville Corp
•
Filing: 1957-06-06
•
Granted: 1961-03-07
•
Expires: 1977-06-06
Abstract
No abstract record available.
Inventors
- 👤 William A Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:52
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/04; F24F7/06; F24F7/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2172771A
Cited
US2180945A
Cited
US2251663A
Cited
US2276788A
Cited
US2587884A
Cited
US2775927A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-06 | 1964-09-05 | 1965-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-06 | 1968-09-05 | 1969-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-06 | 1972-09-05 | 1973-03-07 | $7700.00 | Window Closed / Lapsed |