US3469477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Board perforator and cutter
Assignee: National Gypsum Co
•
Filing: 1967-05-10
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Granted: 1969-09-30
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Expires: 1987-05-10
Abstract
No abstract record available.
Inventors
- 👤 George D Welch
- 👤 Leonard L Donahe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:55
CPC Classifications
B; B26; B26D; B26D9/00; Y; Y10; Y10T; Y10T83/00; Y10T83/02; Y10T83/0333; Y10T83/0348; Y10T83/465; Y10T83/4708; Y10T83/4711; Y10T83/4766; Y10T83/4795; Y10T83/483; Y10T83/4833
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) | 1972-09-29 | 1973-03-31 | 1973-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-29 | 1977-03-31 | 1977-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-29 | 1981-03-31 | 1981-09-30 | $7700.00 | Window Closed / Lapsed |