US3471597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perforating film by electrical discharge
Assignee: WR Grace and Co
•
Filing: 1967-06-27
•
Granted: 1969-10-07
•
Expires: 1987-06-27
Abstract
No abstract record available.
Inventors
- 👤 Henry G Schirmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:21
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/26; B26F1/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2365576A
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US2385246A
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US2678373A
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US2859480A
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US3167641A
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US3098143A
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US3206590A
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US3391044A
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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 |