US3471903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stud-backed fasteners
Assignee: 3M Co
•
Filing: 1967-10-24
•
Granted: 1969-10-14
•
Expires: 1987-10-24
Abstract
No abstract record available.
Inventors
- 👤 Walter E Northrup
- 👤 Robert M Spatafore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:31
CPC Classifications
A; A44; A44B; A44B18/00; A44B18/0046; A44B18/0053; B; B29; B29C; B29C67/00; B29C67/0044; Y; Y10; Y10T; Y10T24/00; Y10T24/27; Y10T24/2708; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49876
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE19238E
Cited
US1972155A
Cited
US3031730A
Cited
FR1216512A
Cited
US3049781A
Cited
US3135820A
Cited
US3266113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |