Patent US2709081A successfully refreshed from Google Patents.
US2709081A
Expired / Lapsed
US
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Envelope blank feeding mechanism
Assignee: PARTEN MACHINERY CO
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Filing: 1950-12-29
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Granted: 1955-05-24
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Expires: 1970-12-29
Abstract
No abstract record available.
Inventors
- 👤 Ormonde P Welsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:34
CPC Classifications
B; B31; B31B; B31B70/00; B31B70/02; B31B70/04; B31B2150/00; B31B2160/00; B31B2160/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US584007A
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US2016711A
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US1982823A
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US2057279A
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US2220073A
Cited
US2244250A
Cited
US2265007A
Cited
US2395497A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-23 | 1958-11-22 | 1959-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-23 | 1962-11-22 | 1963-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-23 | 1966-11-22 | 1967-05-24 | $7700.00 | Window Closed / Lapsed |