Patent US3122697A successfully refreshed from Google Patents.
US2057731A
Expired / Lapsed
US
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Sound absorbing material
Assignee: Celotex Corp
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Filing: 1931-01-03
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Granted: 1936-10-20
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Expires: 1951-01-03
Abstract
No abstract record available.
Inventors
- 👤 Treadway B Munroe
- 👤 Waterfall Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:37
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; G10K11/165; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/86; E04B2001/8457
Claims Analysis
Total Claims: 0
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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) | 1939-10-20 | 1940-04-20 | 1940-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-10-20 | 1944-04-20 | 1944-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-10-20 | 1948-04-20 | 1948-10-20 | $7700.00 | Window Closed / Lapsed |