Patent US2991644A successfully refreshed from Google Patents.
US2991644A
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Assignee: Edwards Co Inc
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Filing: 1958-08-29
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Granted: 1961-07-11
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Expires: 1978-08-29
Abstract
No abstract record available.
Inventors
- 👤 Robert S Edwards
- 👤 Albert E Sharp
- 👤 Kupferschmitt Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:03
CPC Classifications
E; E05; E05B; E05B37/00; E05B37/08; E05B37/0075; E05B37/0082; E05B63/00; E05B63/04; Y; Y10; Y10T; Y10T70/00; Y10T70/50; Y10T70/5093; Y10T70/5155; Y10T70/5199; Y10T70/5372; Y10T70/5531; Y10T70/70; Y10T70/7153; Y10T70/7181; Y10T70/7198; Y10T70/7237; Y10T70/7243; Y10T70/7249; Y10T70/7316; Y10T70/735; Y10T70/7401
Claims Analysis
Total Claims: 0
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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) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |