US2421272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Papermaking apparatus
Assignee: GERALD T SHIPMAN
•
Filing: 1944-11-18
•
Granted: 1947-05-27
•
Expires: 1964-11-18
Abstract
No abstract record available.
Inventors
- 👤 Harry T Knearem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:57
CPC Classifications
D; D21; D21G; D21G1/00; D21G1/0006; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2142; Y10T74/2154
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US684166A
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AT41873B
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US1455976A
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US1545638A
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GB355000A
Cited
DE591441C
Cited
US2208340A
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US2351902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-26 | 1950-11-25 | 1951-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-26 | 1954-11-25 | 1955-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-26 | 1958-11-25 | 1959-05-27 | $7700.00 | Window Closed / Lapsed |