US2981252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diving mask
Assignee: Individual
•
Filing: 1958-12-29
•
Granted: 1961-04-25
•
Expires: 1978-12-29
Abstract
No abstract record available.
Inventors
- 👤 Sato Kenshun
- 👤 Asari Kumaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:34
CPC Classifications
B; B63; B63C; B63C11/00; B63C11/02; B63C11/12; B63C11/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |