Individual holder
SPRONKEN JOHN R
CA·4 granted patents·150 citations·filing 1988–1990
Individually held — no corporate assignee on record.
Top patents by PatentIndex Score
4 records- 0183US4922676AClosure and seal for prefabricated building panelsSPRONKEN JOHN R·Filed 1989·Granted May 8, 1990·57 cites·2 claims
- 0282US4989382AConnectors for concrete structural elementsSPRONKEN JOHN R·Filed 1989·Granted Feb 5, 1991·48 cites·7 claims
- 0360US5118060AAdjustable bracket for building constructionSPRONKEN JOHN R·Filed 1990·Granted Jun 2, 1992·32 cites·4 claims
- 0444US4898358AForm-work for concreteSPRONKEN JOHN R·Filed 1988·Granted Feb 6, 1990·13 cites·9 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →