US1988640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing rubber covered suction rolls
Assignee: Library and Archives Canada
•
Filing: 1933-03-06
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Granted: 1935-01-22
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Expires: 1953-03-06
Abstract
No abstract record available.
Inventors
- 👤 Hubert G Welsford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:06
CPC Classifications
B; B29; B29D; B29D99/00; B29D99/0032; B29D99/0035; B29C; B29C2793/00; B29C2793/0045; B29K; B29K2021/00; B29L; B29L2031/00; B29L2031/32; B29L2031/324; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1056; Y10T156/1057
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-01-21 | 1938-07-23 | 1939-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-01-21 | 1942-07-23 | 1943-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-01-21 | 1946-07-23 | 1947-01-22 | $7700.00 | Window Closed / Lapsed |