US3491639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube perforator
Assignee: Spir L Ok Industries Ltd
•
Filing: 1968-04-29
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Granted: 1970-01-27
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Expires: 1988-04-29
Abstract
No abstract record available.
Inventors
- 👤 Gerald K Hale
- 👤 Arthur W Hale
- 👤 Reginald D Hale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:49
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/24; B21D28/28; B26; B26F; B26F1/00; B26F1/0015; Y; Y10; Y10T; Y10T83/00; Y10T83/384; Y10T83/385; Y10T83/748; Y10T83/7487; Y10T83/7493; Y10T83/75; Y10T83/808; Y10T83/869; Y10T83/8691; Y10T83/8694; Y10T83/8821; Y10T83/8825
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) | 1973-01-26 | 1973-07-28 | 1974-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-26 | 1977-07-28 | 1978-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-26 | 1981-07-28 | 1982-01-27 | $7700.00 | Window Closed / Lapsed |