US3470978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Punched acoustical board
Assignee: Conwed Corp
•
Filing: 1968-11-22
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Granted: 1969-10-07
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Expires: 1988-11-22
Abstract
No abstract record available.
Inventors
- 👤 Halvor Paul Wagtskjold
- 👤 George H Sundin
- 👤 Lorien A Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:59
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/16; G10K11/172; B; B26; B26F; B26F1/00; B26F1/24; Y; Y10; Y10T; Y10T83/00; Y10T83/02; Y10T83/0237; Y10T83/0244
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |