Patent US2990731A successfully refreshed from Google Patents.
US2990731A
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Fitting for perforating steel walled members
Assignee: MB Skinner Co
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Filing: 1959-06-29
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Granted: 1961-07-04
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Expires: 1979-06-29
Abstract
No abstract record available.
Inventors
- 👤 Patterson D Merrill
- 👤 William A Curtis
- 👤 Freeuw Henry J De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:13
CPC Classifications
F; F16; F16L; F16L41/00; F16L41/04; B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/28; B21C37/29; B21C37/292; Y; Y10; Y10T; Y10T137/00; Y10T137/598; Y10T137/612; Y10T137/6123; Y10T408/00; Y10T408/89; Y10T408/895; Y10T408/899; Y10T408/909; Y10T408/9093
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE24199E
Cited
US1020302A
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US1881787A
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US2382639A
Cited
US2606615A
Cited
US2950637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |