Patent US2996780A successfully refreshed from Google Patents.
US2996780A
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US
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Slide fastener structure employing helical fastener member
Assignee: Individual
•
Filing: 1958-07-01
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Granted: 1961-08-22
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Expires: 1978-07-01
Abstract
No abstract record available.
Inventors
- 👤 Porepp Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:06
CPC Classifications
A; A44; A44B; A44B19/00; A44B19/24; A44B19/40; A44B19/406; Y; Y10; Y10T; Y10T24/00; Y10T24/25; Y10T24/2518; Y10T24/2527
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
US777973A
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US2198345A
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US2300442A
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US2306873A
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US2497821A
Cited
US2511414A
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US2643432A
Cited
US2858592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |