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US2931660A
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Assignee: Individual
•
Filing: 1956-05-17
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Granted: 1960-04-05
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Expires: 1976-05-17
Abstract
No abstract record available.
Inventors
- 👤 Barwinkel Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:45
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/12; B23B31/1207; B23B31/123; B23B31/1253; Y; Y10; Y10S; Y10S279/00; Y10S279/902; Y10T; Y10T279/00; Y10T279/17; Y10T279/17411; Y10T279/17461; Y10T279/17487; Y10T279/17504; Y10T279/17564; Y10T279/17572; Y10T279/17581; Y10T279/17615; Y10T279/17658
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE417144C
Cited
US1606972A
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US1804506A
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CH147281A
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US1935645A
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US2585747A
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US2809845A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |