Inventor

SPRUILL DAVID B

US3 patents

⚠️ This page may combine multiple inventors who share the name “SPRUILL DAVID B”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

PHILIP MORRIS MANAGEMENT CORP

2 patents

US5037459AAug 6, 1991

Device for controlling relative humidity within a substantially sealed container

PHILIP MORRIS MANAGEMENT CORP77 citations93

US5035731AJul 30, 1991

Device for controlling relative humidity within a substantially sealed container

PHILIP MORRIS MANAGEMENT CORP55 citations93

PHILIP MORRIS INC

1 patent

US4687008AAug 18, 1987

Filter cigarette

PHILIP MORRIS INC178 citations98