US2796636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic tile
Assignee: Individual
•
Filing: 1952-12-16
•
Granted: 1957-06-25
•
Expires: 1972-12-16
Abstract
No abstract record available.
Inventors
- 👤 Paul K Heerwagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:35
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/8409; E04B2001/8263; E04B2001/8414; E04B2001/8423; E04B2001/8442
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US330916A
Cited
US855816A
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US857718A
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US1913249A
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US2090043A
Cited
DE721802C
Cited
US2156277A
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US2323417A
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US2497912A
Cited
US2494157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-24 | 1960-12-24 | 1961-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-24 | 1964-12-24 | 1965-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-24 | 1968-12-24 | 1969-06-25 | $7700.00 | Window Closed / Lapsed |