Patent US2879735A successfully refreshed from Google Patents.
US2828596A
Expired / Lapsed
US
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Automatic bag opening machine
Assignee: Spencer Chemical Co
•
Filing: 1954-03-09
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Granted: 1958-04-01
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Expires: 1974-03-09
Abstract
No abstract record available.
Inventors
- 👤 Lee B Dowty
- 👤 Leonard J Heavin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:37
CPC Classifications
B; B65; B65B; B65B43/00; B65B43/12; B65B43/14; B65B43/16; B65B43/18
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) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |