US2720935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silencing of sound
Assignee: JARVIS C MARBLE
•
Filing: 1950-08-30
•
Granted: 1955-10-18
•
Expires: 1970-08-30
Abstract
No abstract record available.
Inventors
- 👤 Lysholm Alf
- 👤 Boestad Gustav Karl William
- 👤 Nilsson Hans Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:19
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/007; F01N1/00; F01N1/02; F01N1/08; F01N1/085; F01N1/10; F02; F02M; F02M35/00; F02M35/12; F02M35/1205; F02M35/1227; F02M35/1233; G; G10; G10K; G10K11/00; G10K11/16; G10K11/172; F01N2490/00; F01N2490/20; Y; Y10; Y10S; Y10S261/00; Y10S261/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US806714A
Cited
US1475769A
Cited
GB292323A
Cited
US1866004A
Cited
US2325352A
Cited
US2017748A
Cited
US2017744A
Cited
US2075265A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |