US3538797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for punching acoustical board
Assignee: Conwed Corp
•
Filing: 1969-02-12
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Granted: 1970-11-10
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Expires: 1989-02-12
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
2026-11-07 10:10
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/24; G; G10; G10K; G10K11/00; G10K11/16; G10K11/172; Y; Y10; Y10T; Y10T83/00; Y10T83/02; Y10T83/0237; Y10T83/0244; Y10T83/202; Y10T83/2092; Y10T83/2096; Y10T83/21; Y10T83/2103; Y10T83/2105; Y10T83/2107; Y10T83/242; Y10T83/465; Y10T83/4766; Y10T83/4795; Y10T83/869; Y10T83/8789; Y10T83/929; Y10T83/9314
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) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |