Inventor · disambiguated record
Franciscus Roffelsen
Also filed as: ROFFELSEN FRANCISCUS
16 granted patents·1 pending application·275 citations·filing 1972–2002
94Inventor score
Top patents by PatentIndex Score
17 records- 0180US6926069B1Method for manufacturing a double-walled heat exchanging tube with leak detectionSPIRO RESEARCH BV·Filed 2000·Granted Aug 9, 2005·24 cites·14 claims
- 0279US4027691ADevice for venting and aerating closed circulatory water flow systemsSPIRO RESEARCH NV·Filed 1975·Granted Jun 7, 1977·34 cites·7 claims
- 0377US4718922AMethod of and apparatus for the deaeration of liquid flowing in a closed circulation systemSPIRO RESEARCH BV·Filed 1985·Granted Jan 12, 1988·32 cites·24 claims
- 0477US4456172AMethod of and apparatus for the degasification of circulation systems for liquidsSPIRO RESEARCH BV·Filed 1981·Granted Jun 26, 1984·29 cites·6 claims
- 0576US4381928AApparatus for venting and/or degassing a pipeline systemSPIRO RESEARCH BV·Filed 1981·Granted May 3, 1983·30 cites·39 claims
- 0666US4645518AMethod and apparatus for reducing the gas content of a liquidSPIRO RESEARCH BV·Filed 1985·Granted Feb 24, 1987·21 cites·34 claims
- 0764US4655282AHeat exchanger duct with heat exchange wiringSPIRO RESEARCH BV·Filed 1984·Granted Apr 7, 1987·20 cites·5 claims
- 0858US6192583B1Heat exchanger tube and method of manufacturing sameSPIRO RESEARCH BV·Filed 1997·Granted Feb 27, 2001·18 cites·16 claims
- 0957US4747737AFixing device for mounting objects on supportsSPIRO RESEARCH BV·Filed 1986·Granted May 31, 1988·22 cites·11 claims
- 1051US5601635AMethod and apparatus for deaerating a liquid in a substantially closed liquid circulation systemSPIRO RESEARCH BV·Filed 1994·Granted Feb 11, 1997·15 cites·10 claims
- 1147US6526921B1Method for operating a closed hot-water installation and apparatus to be used therewithSPIRO RESEARCH BV·Filed 1999·Granted Mar 4, 2003·11 cites·11 claims
- 1237US6968863B1Non-return valveROFFELSEN FRANCISCUS·Filed 1999·Granted Nov 29, 2005·8 cites·15 claims
- 1337US2004244847A1Method for feeding a closed liquid systemFiled 2002·Application pending·0 cites
- 1435US6119951AExpansion control for a closed fluid circulation systemSPIRO RESEARCH BV·Filed 1996·Granted Sep 19, 2000·5 cites·13 claims
- 1531US5456409AMethod and device for maintaining a fluid at a working pressure in a substantially closed fluid circulation systemSPIRO RESEARCH BV·Filed 1993·Granted Oct 10, 1995·3 cites·22 claims
- 1629US4646823APipe for utility or service systemsSPIRO RESEARCH BV·Filed 1985·Granted Mar 3, 1987·1 cites·2 claims
- 1726US3968554AHeat exchangerNAAMLOZE VENOOTSCHAP SPIRO RES·Filed 1972·Granted Jul 13, 1976·2 cites·1 claims
Join the waitlist — get patent alerts
Get an alert when Franciscus Roffelsen files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →