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Patent US2401906A successfully refreshed from Google Patents.
US2401906A
Expired / Lapsed
US
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Sound-absorbing treatment
Assignee: Johns Manville Corp
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Filing: 1942-08-27
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Granted: 1946-06-11
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Expires: 1962-08-27
Abstract
No abstract record available.
Inventors
- 👤 Clinton B Burnett
- 👤 William T Donahue
- 👤 Fred T Randolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:58
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/04; E04B9/045; E04B9/001
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) | 1949-06-10 | 1949-12-10 | 1950-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-06-10 | 1953-12-10 | 1954-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-06-10 | 1957-12-10 | 1958-06-11 | $7700.00 | Window Closed / Lapsed |