US2029441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustical structure
Assignee: Johns Manville Corp
•
Filing: 1933-12-12
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Granted: 1936-02-04
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Expires: 1953-12-12
Abstract
No abstract record available.
Inventors
- 👤 John S Parkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:33
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; G10K11/168; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/86; E04B2001/8263; E04B2001/8281; E04B2001/8423; E04B2001/8452
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) | 1939-02-03 | 1939-08-05 | 1940-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-02-03 | 1943-08-05 | 1944-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-02-03 | 1947-08-05 | 1948-02-04 | $7700.00 | Window Closed / Lapsed |