US2622491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making multiply waterproofed sheets
Assignee: Patent and Licensing Corp
•
Filing: 1948-10-04
•
Granted: 1952-12-23
•
Expires: 1968-10-04
Abstract
No abstract record available.
Inventors
- 👤 Chester R Macdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:31
CPC Classifications
D; D21; D21F; D21F11/00; D21F11/06; D21F11/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1616902A
Cited
US695787A
Cited
US1725647A
Cited
US1616921A
Cited
US1616901A
Cited
DE409233C
Cited
US1616903A
Cited
US1606428A
Cited
US1782855A
Cited
US1995346A
Cited
US1939082A
Cited
US1864116A
Cited
US1969308A
Cited
US2272144A
Cited
US2544887A
Cited
US2481374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-23 | 1956-06-23 | 1956-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-23 | 1960-06-23 | 1960-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-23 | 1964-06-23 | 1964-12-23 | $7700.00 | Window Closed / Lapsed |