US3494020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welding backup tape
Assignee: 3M Co
•
Filing: 1966-12-05
•
Granted: 1970-02-10
•
Expires: 1986-12-05
Abstract
No abstract record available.
Inventors
- 👤 Lew Wallace Cornell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:27
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/02; B23K35/0255; B23K9/00; B23K9/02; B23K9/035; B23K9/0356; C; C09; C09J; C09J7/00; C09J7/20; C09J7/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2820427A
Cited
US3372852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |