Patent US2803171A successfully refreshed from Google Patents.
US2803171A
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Process for producing a water vapor impermeable board
Assignee: Patent and Licensing Corp
•
Filing: 1953-08-26
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Granted: 1957-08-20
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Expires: 1973-08-26
Abstract
No abstract record available.
Inventors
- 👤 Richard H Cubberley
- 👤 Dell M Benjamin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:07
CPC Classifications
D; D21; D21J; D21J1/00; D21J1/08; C; C09; C09K; C09K23/00; C09K23/017; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/38; D21H17/39; D21H17/60; D21H19/00; D21H19/10; D21H19/14; D21H19/18; D21H19/36; D21H19/38; D21H19/40; D21H19/44; D21H19/56; D21H19/58; D21J1/16
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) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |